Math Is Fun Forum

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi ganesh;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,403

Re: 10 second questions

Hi bobbym,

The solution #4167 is perfect. Good work!

#4169. Two trains are moving in the same direction at 55 kilometers per hour and 35 kilometers per hour. The faster train crosses a man in slower train in 27 seconds. What is the length of the faster train?

#4170. A train 108 meters long moving at a speed of 50 kilometers per hour crosses a train 112 meters long coming from opposite direction in 6 seconds. What is the speed of the second train in kilometers per hour?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,403

Re: 10 second questions

Hi bobbym,

The solutions #4169 and #4170 are correct. Brilliant!

#4171. Two pipes A and B can fill a tank in 20 hours and 30 hours respectively. If both the pipes are opened simultaneously, how much time would be taken to fill the tank?

#4172. A pipe can fill a tank in 12 hours. Due to leak in the bottom, it is filled in 15 hours. If the tank is full, how much time would the leak take to empty it?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,403

Re: 10 second questions

Hi bobbym,

The solutions #4171 and #4172 are correct. Good work!

#4173. A man rows downstream 33 kilometers and upstream 27 kilometers taking 3 hours each time. What is the velocity of the current?

#4174. A man can row 15 kilometers per hour in still water. It takes him twice as long to row up down the river. Find the rate of stream.

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,403

Re: 10 second questions

Hi bobbym,

The solutions #4173 and #4174 are perfect. Smart work!

#4175. A man can row 10 km/hour in still water and the river is running at 2 km/hour. If the man takes 1 hour to row to a place and back, how far is the place?

#4176. The speed of a boat in standing water is 10 km/hour and the speed of the stream is 2 km/hour. A man rows to a place at a distance of 120 kilometers and returns to the starting point. What is the total time taken by him?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,403

Re: 10 second questions

Hi bobbym,

The solutions #4175 and #4176 are perfect. Excellent!

#4177. A tank can be filled by a tap in 30 minutes and by another tap in 60 minutes. Both the taps are kept open for 5 minutes and the first tap is shut off. After this, the tank would be completely filled in what time?

#4178. If two pipes function simultaneously the reservoir would be filled in 12 hours. One pipe fills the reservoir in 10 hours faster than the other. How many hours it takes the second pipe to fill the reservoir?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi ganesh;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,403

Re: 10 second questions

Hi bobbym,

The solutions #4177 and #4178 are correct. Remarkable!

#4179. What least value must be assigned to * so that 3785*8163 is divisible by 9?

#4180. When a number divided by 342 gives a remainder 47; when the same number is divided by 19, what would be the remainder?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,403

Re: 10 second questions

Hi bobbym,

The solutions #4179 and #4180 are correct. Good work!

#4181. Find the Least Common Multiple of 18, 24, 60, and 150.

#4182. Three numbers are in the ratio 1 : 2 : 3 and their Greatest Common Divisor is 12. What are the numbers?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,403

Re: 10 second questions

Hi bobbym,

The solutions #4181 and #4182 are correct. Good work!

#4183. The average of 7 consecutive numbers is 20. Find the largest number.

#4184. The average of three numbers is 15. Sum of the first two numbers is 25. Find the third number.

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,403

Re: 10 second questions

Hi bobbym,

The solutions #4183 and #4184 are correct. Good work!

#4185. The average of four consecutive odd numbers is 12. Which is the lowest number?

#4186. The average of five consecutive even numbers is 16. Find their largest number.

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: 10 second questions

Hi ganesh

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,403

Re: 10 second questions

Hi anonimnystefy and bobbym,

anonimnystefy : The solution #4185 is correct. Neat job!

bobbym : Both the solutions are correct. Good work!

#4187. A group of 20 girls has average age of 12 years. Average age of first 12 from the same group is 13 years. What is the average age of the other 8 girls?

#4188. A class has 20 boys and 30 girls. The average age of boys is 12 years and that of girls is 11 years. What is the average age of the whole class?

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

anonimnystefy

Real Member

From: Harlan's World

Registered: 2011-05-23

Posts: 16,049

Re: 10 second questions

Hi ganesh

---

“Here lies the reader who will never open this book. He is forever dead.
“Taking a new step, uttering a new word, is what people fear most.” ― Fyodor Dostoyevsky, Crime and Punishment
The knowledge of some things as a function of age is a delta function.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.

Jai Ganesh

Administrator

Registered: 2005-06-28

Posts: 48,403

Re: 10 second questions

Hi anonimnystefy and bobbym,

The solutions #4187 and #4188 are correct. Marvelous!

#4189. The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases by 3 months. Find the age of the teacher.

#4190. A man goes to a certain place at a speed of 30 km/hour and returns to the original place at a speed of 20 km/hour. Find the average speed of the whole journey.

---

It appears to me that if one wants to make progress in mathematics, one should study the masters and not the pupils. - Niels Henrik Abel.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: 10 second questions

Hi ganesh;

---

In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
Always satisfy the Prime Directive of getting the right answer above all else.