question: The average of first 10 even numbers is?
Options:
(A) 17
(B) 199
(C) 16
(D) 11
(E) 123
answer: Stream of consciousness: Sum of 10 even numbers = 10 * 11 = 110
Average = 110/10 = 11 The answer is (D).
--
question: What is theleast number should be added to 1056, so the sum of the number is completely divisible by 23?
Options:
(A) 20
(B) 23
(C) 25
(D) 27
(E) 28
answer: Stream of consciousness: (1056 / 23) gives remainder 21
21 + 2 = 23, So we need to add 2 The answer is (B).
--
question: A man rows his boat 80 km downstream and 45 km upstream, taking 2 1/2 hours each time. Find the speed of the stream?
Options:
(A) 1 kmph
(B) 6 kmph
(C) 5 kmph
(D) 8 kmph
(E) 7 kmph
answer: Stream of consciousness: Speed downstream = d/t = 80/(2 1/2) = 32 kmph
Speed upstream = d/t = 45/(2 1/2) = 18 kmph
The speed of the stream = (32 - 18)/2 = 7 kmph The answer is (E).
--
question: What should come in place of the question mark (?) in the following equation?
5679 + 1438 2015 = ?
Options:
(A) 5192
(B) 5012
(C) 5102
(D) 5002
(E) None of these
answer:
Stream of consciousness: ? = 5679 + 1438 2015 = 5102 The answer is (C).
--