q: Fill in the blank with the correct number in this number series: 20, 65, 27, 61, __, 57, 41, ?
Options:
(A) 34
(B) 35
(C) 38
(D) 25
(E) 56
a: Stream of consciousness: This is a simple alternating subtraction and addition series; The first series begins with 20 and adds 7; the second begins with 65 and subtracts 4, and so on. The answer is (A).

question: By how much is 50% of 250 greater than 25% of 400.
Options:
(A) 25
(B) 26
(C) 29
(D) 39
(E) 26
answer: Stream of consciousness: (50/100) * 250 (25/100) * 400
125 - 100 = 25 The answer is (B).

q: A train 120 meters long completely crosses a 480 meters long bridge in 55 seconds. What is the speed of the train is?
Options:
(A) 32
(B) 545
(C) 39
(D) 40
(E) 09
a: Stream of consciousness: S = (120 + 480)/45 = 600/55 * 18/5 = 39 The answer is (C).

question: A pipe can fill a cistern in 18 minutes whereas the cistern when fill can be emptied by a leak in 36 minutes. When both pipes are opened, find when the cistern will be full?
Options:
(A) 17
(B) 36
(C) 70
(D) 13
(E) 12
answer: Stream of consciousness: 1/18 - 1/36 = 1/36
36 minutes The answer is (B).

q: The compound ratio of 2/3, 6/7, 1/3 and 1/8 is given by?
Options:
(A) 1/45
(B) 1/42
(C) 1/46
(D) 1/48
(E) 1/43
a: Stream of consciousness: 2/3 * 6/7 * 1/3 * 1/8 = 1/42 The answer is (B).

q: A no.when divided by 221 gives a remainder 43, what remainder will beobtained by dividing the same number19?
Options:
(A) 3
(B) 6
(C) 9
(D) 11
(E) 15
a:
Stream of consciousness: 221 + 43 = 264/17 = 9 (Remainder) The answer is (C).