Brain Teasers

Jai Ganesh · 2009-01-08 16:48:56

Answer to #136:-
You are correct, JaneFairfax and careless25!

There are many cases where the next number or entity of the series can have more than one answer.
But try these:-

#144. M, V, E, M, J, S, ____

#145. He, Ne, Ar, Kr, Xe, ___

#146. 111, 222, 333, 444, 555, 666, ____

#147. 1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, ______.

#148. Methane, Ethane, Propane, Butane, _______.

JaneFairfax · 2009-01-08 17:59:26

Last edited by JaneFairfax (2009-01-09 08:50:48)

Jai Ganesh · 2009-01-08 20:28:46

Answers to #145, #146, and #147:-
Answers #146 and #147 are correct. The symbol of Radon is Rn, not Ra, Hence, you've actually scored 2½/3
Anyway, these questions, #144 to #148 were posted to show that they had only ONE possible result.
Well done, JaneFairfax!

Jai Ganesh · 2009-01-08 23:30:53

#149. Complete the series:-
0, 0, 3, 20, 115, 714, _____

#150. What is the coefficient of the middle term of

?

#151. What is the value of 10! divided by the Least Common Multiple of all the Natural numbers from 1 to 10?

Jai Ganesh · 2009-01-09 01:47:18

Find the odd man out:-

#152. Room, Floor, Path, Wall, Window

#153. Mercury, Mars, Jupiter, Saturn

#154. 36, 144, 324, 576, 784.

#155. Pint, Gallon, Meter, Weight, Chain.

JaneFairfax · 2009-01-09 09:10:43

Jai Ganesh · 2009-01-09 17:47:05

Answer to #151:-
You are not permitted to use a calculator;
however, if you remembered the values of 10! as 3628800 and LCM of 1 to 10 as 2520 and used it only for division, that's a little better, although not wholly acceptable.
Your answer is correct!
Good!

Jai Ganesh · 2009-01-10 02:54:38

#156. From a bag containing twenty tickets, numbered from 1 to 20, two tickets are drawn at random. What is the probability that both the tickets have prime numbers on them?

#157. From the same bag as the previous question, two tickets are drawn. What is the probability that one is a prime number and the other is a multiple of 4?

#158. 3 cards are drawn from a well shuffled pack of 52 cards. Find the probability of all the three cards being of the same suit.

#159. P, Q, and R are three relatively Prime numbers. The product of P and Q is 187 and the product of Q and R is 451. What is the sum of the three numbers?

#160. A man and a woman have $3044, the woman and a boy have $2050 and the man and the boy together have $2556. How much do the man, the woman and the boy have together?

JaneFairfax · 2009-01-10 03:16:58

Jai Ganesh · 2009-01-10 03:24:56

Answer to #156:-
Absolutely right, JaneFairfax!

JaneFairfax · 2009-01-10 14:49:35

Jai Ganesh · 2009-01-10 16:36:44

Answers to #157, #158, #159, and #160:-
All correct, JaneFairfax!

Jai Ganesh · 2009-01-10 18:59:22

#131. Find the value of

?

#132. Find the value of

.

JaneFairfax · 2009-01-10 23:49:33

Jai Ganesh · 2009-01-10 23:57:12

Answer to #131:-
Correct, JaneFairfax!

JaneFairfax · 2009-01-11 00:27:45

Last edited by JaneFairfax (2009-01-11 01:04:21)

Jai Ganesh · 2009-01-11 00:39:16

Answer to #132:
(You've marked the answer as #131!)

Perfectly right, JaneFairfax!

Jai Ganesh · 2009-01-11 00:44:26

#133. What are the number of prime factors in

?

Jai Ganesh · 2009-01-11 01:04:17

#134. What is the value of

?

Jai Ganesh · 2009-01-11 01:36:21

#135. What is the value of y if

?

#136. If

, then what is the value of
?

JaneFairfax · 2009-01-11 12:14:13

Jai Ganesh · 2009-01-11 21:18:33

#Answer to #135:-
Perfectly right, JaneFairfax!

Jai Ganesh · 2009-01-11 22:25:17

#137. If x*y = x² + y² -xy, then what is the value of 9*11?

#138. If

,
find the value of 3*(3*-1).

#139. If a*b = 2a -3b + ab, then what is 3*5 + 5*3 equal to?

#140. If x @ y = x² + 2y, what is the value of p if 4 @ (3 @ p) = 50?

#141. If

for all numbers except 0, then what is
(a $ b $ c) $ a $ b equal to?

Jai Ganesh · 2009-01-12 02:54:07

#142. If 50% of (x-y) is equal to 30% of (x+y), then what percentage of x is y?

#143. If the numerator of a fraction be increased by 15% and its denominator be dimished by 8%, the value of the fraction is

. What is the original fraction?

#144. When the price of a product was decreased by 10%, the number sold increased by 30%. What is the effect on the total revenue?

JaneFairfax · 2009-01-12 15:06:55

Math Is Fun Forum

#226 2009-01-08 16:48:56

Re: Brain Teasers

#227 2009-01-08 17:59:26

Re: Brain Teasers

#228 2009-01-08 20:28:46

Re: Brain Teasers

#229 2009-01-08 23:30:53

Re: Brain Teasers

#230 2009-01-09 01:47:18

Re: Brain Teasers

#231 2009-01-09 09:10:43

Re: Brain Teasers

#232 2009-01-09 17:47:05

Re: Brain Teasers

#233 2009-01-10 02:54:38

Re: Brain Teasers

#234 2009-01-10 03:16:58

Re: Brain Teasers

#235 2009-01-10 03:24:56

Re: Brain Teasers

#236 2009-01-10 14:49:35

Re: Brain Teasers

#237 2009-01-10 16:36:44

Re: Brain Teasers

#238 2009-01-10 18:59:22

Re: Brain Teasers

#239 2009-01-10 23:49:33

Re: Brain Teasers

#240 2009-01-10 23:57:12

Re: Brain Teasers

#241 2009-01-11 00:27:45

Re: Brain Teasers

#242 2009-01-11 00:39:16

Re: Brain Teasers

#243 2009-01-11 00:44:26

Re: Brain Teasers

#244 2009-01-11 01:04:17

Re: Brain Teasers

#245 2009-01-11 01:36:21

Re: Brain Teasers

#246 2009-01-11 12:14:13

Re: Brain Teasers

#247 2009-01-11 21:18:33

Re: Brain Teasers

#248 2009-01-11 22:25:17

Re: Brain Teasers

#249 2009-01-12 02:54:07

Re: Brain Teasers

#250 2009-01-12 15:06:55

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