Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
#251 2007-06-05 02:10:03
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
Well done, Identity!
172. A vendore purchased lemons at 6 a $ and sold them for 4 a $. What is his profit percentage?
173. A can complete a work in 6 days and B can complete the same work in 8 days. Together, in how many days can they finish the work?
174. The rates of working of A and B are in the ratio 3:4. What would be the ratio of the number of days taken by them to finish the work?
175. A radio dealer marks a radio with a price which is 20% more than the cost price. He allows a discount of 10% on it. What is his gain percent?
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.
Offline
#252 2007-06-08 02:49:16
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
176. Which term of the series 94, 97, 100.....is 130?
177. Find the 16th term of the Arithmetic Progression 1, 6, 11, 16......
178. Find the sum of the first 100 terms of the series 1, 5, 9, 13, .....
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.
Offline
#253 2007-06-08 15:18:50
- John E. Franklin
- Member
- Registered: 2005-08-29
- Posts: 3,588
Re: 10 second questions
I can't do 177 or 178 in ten seconds.
Last edited by John E. Franklin (2007-06-08 15:21:29)
igloo myrtilles fourmis
Offline
#254 2007-06-08 15:42:58
- Identity
- Member
- Registered: 2007-04-18
- Posts: 934
Re: 10 second questions
I don't believe it's possible to do 178 in 10 seconds 
!
Offline
#255 2007-06-08 21:31:34
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
Well done, John E Frankiln!
Identity,
The sum of n terms of an Arithmetic Progression is given by
Sn=n/2[2a+(n-1)d].
In #178, a = 1, d=4 and n=100.
Therefore, the sum to 100 terms is 50[398]=19900.
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.
Offline
#256 2007-06-09 02:21:52
- JaneFairfax
- Member
- Registered: 2007-02-23
- Posts: 6,868
Re: 10 second questions
Offline
#257 2007-06-09 17:13:55
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
Very well done, Jane Fairfax. The nth term is given by the formula tn=a+(n-1)d where a is the first term and d is the common difference.
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.
Offline
#258 2007-06-12 01:50:50
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
Express the answers as exponents:-
179. Find the 10th term of a Geometric Progression 2/5, 8/25, 32/125.......
180. Find the sum to 20 terms of the Geometric Progression 1, -2, 4, -8, .........
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.
Offline
#259 2007-06-15 18:14:19
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
181. The sum of the roots of the equation 4x²-9x+7=0 is ____________.
182. Find the product of the roots of the equation cx²+dx+cd=0.
183. The equation whose roots are 4, -4 is ____________.
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.
Offline
#260 2007-06-17 02:44:20
- Identity
- Member
- Registered: 2007-04-18
- Posts: 934
Re: 10 second questions
Offline
#261 2007-06-18 01:51:53
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
Identity, well done, your answer to #183 is correct.
The answer to #182 is d, not -d.
The answer to #181 is 9/4.
The sum of roots of the quadratic equation
ax²+bx+c=0 is -b/a and the product of their roots is c/a.
Alternatively, given the roots, the quadratic equation is
x²-(sum of the roots)x + product of the roots=0.
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.
Offline
#262 2007-06-18 01:54:18
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
Find the equation of the straight line whose angle of inclination with the x-axis and y-intercept are given:-
184. θ=60 degrees and y-intercept=2.
185. θ=45 degrees abd y intercept=-3.
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.
Offline
#263 2007-06-23 18:31:12
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
186. If the price of petrol increases by 25% and Raj intends to spend only an additional 15% on petrol, by how much % will he reduce the quantity of petrol purchased?
187. In an election contested by two parties, Party D secured 12% of the total votes more than Party R. If party R got 132,000 votes, by how many votes did it lose the election?
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.
Offline
#264 2007-06-30 18:07:33
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
188. If sinA=5/14, what is tanA?
189. if Cos A = 15/17, what is the value of cosec A?
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.
Offline
#265 2007-06-30 18:38:37
- Identity
- Member
- Registered: 2007-04-18
- Posts: 934
Re: 10 second questions
Can someone please answer 173-174?
Offline
#266 2007-06-30 22:43:05
- mathsyperson
- Moderator
- Registered: 2005-06-22
- Posts: 4,900
Re: 10 second questions
Why did the vector cross the road?
It wanted to be normal.
Offline
#267 2007-07-01 01:57:05
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
Absolutely right, mathsyperson!!!
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.
Offline
#268 2007-07-27 05:00:19
- mpthomas
- Member
- Registered: 2007-07-27
- Posts: 7
Re: 10 second questions
When will there be more questions?
Offline
#269 2007-08-20 22:02:05
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
190. What would be the last digit of
43^133?
191. What would be the last digit of 47^51?
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.
Offline
#270 2007-08-22 22:51:26
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
192. What is 15% of 20% of 300?
193. What is 1000 divided by 13 (just the whole number part of the quotient)?
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.
Offline
#271 2007-08-23 00:35:21
- Identity
- Member
- Registered: 2007-04-18
- Posts: 934
Re: 10 second questions
190. What would be the last digit of
43^133?191. What would be the last digit of 47^51?
Last edited by Identity (2007-08-23 00:38:43)
Offline
#272 2007-08-24 00:48:05
- Jai Ganesh
- Administrator
- Registered: 2005-06-28
- Posts: 48,385
Re: 10 second questions
Excellent, Idnetity!
194. What do the numbers 343 and 729 have in common?
195. What is the significance of the number 0.47712125471 (approximately) to mathematicians?
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.
Offline
#273 2007-08-31 16:37:53
- John E. Franklin
- Member
- Registered: 2005-08-29
- Posts: 3,588
Re: 10 second questions
igloo myrtilles fourmis
Offline
#274 2007-08-31 18:55:16
- Identity
- Member
- Registered: 2007-04-18
- Posts: 934
Re: 10 second questions
Last edited by Identity (2007-08-31 19:02:22)
Offline
#275 2007-09-04 01:12:00
- Devantè
- Real Member
- Registered: 2006-07-14
- Posts: 6,400
Re: 10 second questions
Last edited by Devantè (2007-09-04 01:15:23)
Offline