question: Find the wrong number below mentioned series
11,150,280,560,800
Options:
(A) 800
(B) 560
(C) 280
(D) 150
(E) 11
answer: Stream of consciousness: 11 is the only prime number or odd number in the series. The answer is (E).

q: In a race with 30 runners where 3 trophies will be given to the top 5 runners (the trophies are distinct: first place, second place, etc), how many ways can this be done?
Options:
(A) 5^3 ways
(B) 8^9 ways
(C) 7^8 ways
(D) 8^7 ways
(E) 8^6 ways
a: Stream of consciousness: 5 people can be prized with 3 distinct prizes in 5^3 ways The answer is (A).

question: Two pipes A and B can fill a cistern in 20 and 30 minutes respectively, and a third pipe C can empty it in 50 minutes. How long will it take to fill the cistern if all the three are opened at the same time?
Options:
(A) 17 1/4 min
(B) 28 1/7 min
(C) 17 1/7 min
(D) 17 1/8 min
(E) 15 15/19 min
answer: Stream of consciousness: 1/20 + 1/30 - 1/50 = 19/300
300/19 = 15 15/19 The answer is (E).

q: Find the product of the local value and absolute value of 4 in 20468?
Options:
(A) 1000
(B) 1100
(C) 1200
(D) 1340
(E) 1600
a: Stream of consciousness: Local value of 4 = 4 x 100 = 400
Place value of 4 = 4
There fore = 4 x 400 = 1600 The answer is (E).

question: A man, a woman and a boy can complete a job in 3, 4 and 12 days respectively. How many boys must assist 1 man and 1 woman to complete the job in 1/4 of a day?
Options:
(A) 22
(B) 66
(C) 28
(D) 41
(E) 61
answer: Stream of consciousness: (1 man + 1 woman)'s 1 day work = (1/3 + 1/4) = 7/12 Work done by 1 man and 1 woman in 1/4 day = (7/12 * 1/4) = 7/48
Remaining work = (1 - 7/48) = 41/48
Work done by 1 boy in 1/4 day = ( 1/12 * 1/4) = 1/48
Number of boys required = 41/48 * 41 = 41. The answer is (D).

question: Find the value of y from (12)^3 x 6^4 432 = y?
Options:
(A) 2345
(B) 3456
(C) 2334
(D) 3456
(E) 5184
answer:
Stream of consciousness: Given Exp. = (12)3 x 64 = (12)3 x 64 = (12)2 x 62 = (72)2 = 5184
432 12 x 62 The answer is (E).