question: In a question on division with zero remainder, a candidate took 12 as divisor instead of 21. The quotient obtained by him was 35. The correct quotient is:
Options:
(A) 15
(B) 18
(C) 20
(D) 22
(E) 24
answer: Stream of consciousness: Number = (35 * 12) = 420
Correct quotient = 420/21 = 20 The answer is (C).


q: The speed of a train is 90 kmph. What is the distance covered by it in 30 minutes?
Options:
(A) 15
(B) 66
(C) 77
(D) 52
(E) 45
a: Stream of consciousness: 90 * 30/60 = 45 kmph The answer is (E).


question: John has 10pairs of dark blue socks and 10pairs of black socks. He keeps them all in the same bag. If he picks out 3socks at random, then what is the probability thathe will get a matching pair?
Options:
(A) 1
(B) 3
(C) 4
(D) 5
(E) 6
answer: Stream of consciousness: If he draws any combination of 3 socks he will definitely have the matching pair of either colour. The answer is (A).


q: Three pipes A, B and C can fill a tank from empty to full in 30 minutes, 20 minutes and 10 minutes respectively. When the tank is empty, all the three pipes are opened. A, B and C discharge chemical solutions P, Q and R respectively. What is the proportion of solution R in the liquid in the tank after 3 minutes?
Options:
(A) 6/15
(B) 6/11
(C) 6/14
(D) 6/12
(E) 6/13
a: Stream of consciousness: Part filled by (A + B + C) in 3 minutes = 3(1/30 + 1/20 + 1/10) = 11/20
Part filled by C in 3 minutes = 3/10
Required ratio = 3/10 * 20/11 = 6/11 The answer is (B).


question: Find the odd man out 4, 5, 15, 49, 201, 1011, 6073
Options:
(A) 10
(B) 7
(C) 5
(D) 2
(E) 3
answer: Stream of consciousness: 4 x 1 + 2 = 6
6 x 2 + 3 = 15
15 x 3 + 4 = 49
49 x 4 + 5 = 210 The answer is (C).


question: A 240 meter long train crosses a man standing on the platform in 6 sec. What is the speed of the train?
Options:
(A) 228
(B) 144
(C) 1266
(D) 188
(E) 211
answer:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
Stream of consciousness: S = 240/6 * 18/5 = 144 kmph The answer is (B).