10 second questions

Jai Ganesh · 2007-02-14 02:46:28

113. Complete the series...
1, 3, 10, 21, 64, 129, _____, 777.

114. It takes 2 minutes to boil a single egg. How many minutes will it take to boil 5 eggs together?

115. If the fifth of the month falls two days after Monday, what day of the week would precede the nineteenth of the month?

116. If 5 boys write 5 pages in 5 minutes, in how many minutes can one boy write one page?

117. An aeroplane flies twice as fast as a Superfast train runs. The train covers 60 miles in 90 minutes. What distance would the aeroplane cover in 20 minutes?

118. A lady is five years younger than her husband. The husband is 5 times as old as their daughter. If the daughter was 5 years old exactly three years ago, what is the lady's present age?

Jai Ganesh · 2007-02-14 16:22:50

OMG! kylekatarn, The problem does not require such an analysis, and your answer isn't correct!

I shall post the solution after some time! As a matter of fact, the problem is far more simpler, but I understand solving the 'Complete the series' is never easy!

119. Divide a sum of $832 between A and B in the ratio 1/3:1/5.

120. I paid $27.20 as Sales Tax on the sale of a wrist-watch worth $340. What is the rate of the Sales Tax?

Jai Ganesh · 2007-02-15 16:12:13

Solution to 113:- Complete the series...
1, 3, 10, 21, 64, 129, _____, 777.

Lets name the first term as t1, second as t2, the third as t3 and so on.
t1=1
t2=(t1x2)+1=3
t3=(t2x3)+1=10
t4=(t3x2)+1=21
t5=(t4x3)+1=64
t6=(t5x2)+1=129
t7=(t6x3)+1=(129x3)+1=388
t8=(t7x2)+1=(388x2)+1=777

121. Find the sum of the first 200 terms in the series
1, 5, 9, 13, ................

122. What is the value of
11³+12³+13³+14³+...................19³+20³?

123. What is the value of

Jai Ganesh · 2007-02-16 03:00:56

Yes, kylekatarn, I agree with you.
I remember having read an SMS puzzle (pun intended),
which says, if 1=5, 2=25, 3=125, and 4=625, then 5=?
Instinctively, the credulous reader calculates what 625x5 is,
but the answer is 5=1, because that was what we started with

124. A person travels 2 miles from the starting poing, turns left and travels 3 miles, then turns left again and travels 6 miles. How far is he from the starting point?

125. 1/3:1/4::20x:?

Toast · 2007-02-16 13:04:16

Unless, of course, 1 = 3125

Jai Ganesh · 2007-02-16 16:45:24

126. The slant height of a cone is 26 cm and the diameter of the base is 20 cm. What is its vertical height?

127. What is the value of (2 tan30°)/(1+tan²30°) ?

Jai Ganesh · 2007-02-17 16:54:47

Well done, kylekatarn!

128. How many twin Primes exist between 1 and 100?
Note:- 1 is neither prime nor non-prime; 2 and 3 are not twin-primes.

129. How many years does the farthest planet in the Solar System take to go around the Sun once?

130. How many leap years were there in the twentieth century?

mathsyperson · 2007-02-17 23:55:07

Jai Ganesh · 2007-02-18 00:03:42

126 :- You are correct, well done, mathsyperson!

130:- 20th century is 1901 AD to 2000 AD. Would you like to change the answer?

mathsyperson · 2007-02-18 00:49:55

Ah, well in that case

Now that I think about it, that does make more sense.
Using my logic, the first century would have been from 0 to 99AD, but there wasn't a year 0 so that wouldn't have worked.

Jai Ganesh · 2007-02-18 01:02:57

Correct, mathsperson! Good work!

131. The sum of double of a natural number and three
times another natural number is less than 24. If the first natural
number is less than or equal to eight, then what is the highest value of the second natural number?

132. The boys and girls in a school are in the ratio 3 : 7.
25% of the boys and 20% of the girls are scholarship holders.
What per cent of the total students do not get scholarships?

133. Stephen is 7 times as old as his son. 10 years hence,
he would be 3 times as old as his son. What are their present
ages (in years)?

Jai Ganesh · 2007-02-18 01:13:24

134. In how many ways can we arrange 6 books on
different subjects, in a shelf?

135. The average of 4 consecutive even numbers is 9. Find the first number.

136. A certain sum of money doubles in 10 years at simple
interest. What is the rate of interest?

Devantè · 2007-02-18 01:15:05

130) This is one of those odd questions. The normal answer would be 27, but then we totally skipped the year 0. That is a year itself. A leap year would start on the year 0. If we followed this rule, there would be 25 in the 20th century...

michi · 2007-02-18 04:31:00

135) first number= 6

Jai Ganesh · 2007-02-18 16:27:44

Correct, Devante`. Well done.

Well done, michi! Excellent!
Welcome to the forum!

Jai Ganesh · 2007-02-18 16:29:15

137. 2F7 in Hexadecimal is ________ in Decimal.

138. How is 65536 in decimal expressed in Hexadecimal?

pi man · 2007-02-18 17:42:40

Jai Ganesh · 2007-02-19 02:46:10

Very well done, kylekatarn!
You are correct!
Excellent, pi man!
But for your answers to #132 and #136, your answers are all correct! Very well done! Please try these questions again!

139. If

what is the value of n?

140. Which of the four is the greatest?

7/22, 11/30, 12/31 or 4/11?

pi man · 2007-02-19 03:02:43

Are you sure about #132?

Jai Ganesh · 2007-02-19 03:25:45

pi man,
this happens to me quite often!
Once, while disbursing the salary, instead of putting Rs.12,500/- in a cover, I put Rs.15,200/- and I was wondering where Rs.2,700/- had vanished! I kept checking the covers, but I was unable to find out where I'd gone wrong!
It was a big relief when the person for whom it was intended, counted the money, and returned the excess!

141. How many degrees is a radian approximately?

142. If 3tanθ=4, what is the value of

?

pi man · 2007-02-19 03:52:37

Jai Ganesh · 2007-02-19 03:58:41

Very well done, pi man!
You are correct! The explanation and reasoning were interesting!
I use a simple technique.
To compare a/b and c/d, find the products ad and bc. ad would respresent a/b and bc would be for c/d.
If ad is greater, the first fraction is greater, and so on.
This way, be eliminating the lesser fractions, I'd reach the greatest!

Jai Ganesh · 2007-02-19 04:05:47

Excellent, kylekatarn!
It would have been a good enough answer if someone had replied 57.
Well done!

pi man · 2007-02-19 04:32:45

Ganesh - I agree with kylekatarn. Excellent work. Are you keeping track of which ones haven't been successfully answered? If so, maybe publish that list occasionally.

pi man · 2007-02-19 06:46:45

136. A certain sum of money doubles in 10 years at simple
interest. What is the rate of interest?

Math Is Fun Forum

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