question: 252 can be expressed as a product of primes as:
Options:
(A) 2 x 2 x 3 x 3 x 7
(B) 2 x 2 x 2 x 3 x 7
(C) 3 x 3 x 3 x 3 x 7
(D) 2 x 3 x 3 x 3 x 7
(E) 7 x 3 x 3 x 3 x 7
answer: Stream of consciousness: 252 = 2 x 2 x 3 x 3 x 7. The answer is (A).
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question: The average of five numbers is 18. The average of first two numbers is 14 and the average of last two numbers is 19. What is the middle number?
Options:
(A) 24
(B) 27
(C) 29
(D) 32
(E) 34
answer: Stream of consciousness: The total of seven numbers = 5X18 = 90
The total of first 2 and last 2 numbers is = 2 X 14+2 X 19 = 66
So, the middle number is (90 - 66 ) = 24 The answer is (A).
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question: A train running at the speed of 60 km/hr crosses a pole in 6 seconds. Find the length of the train.
Options:
(A) 150 m
(B) 145 m
(C) 100 m
(D) 135 m
(E) 155 m
answer: Stream of consciousness: Speed = 60*(5/18) m/sec = 50/3 m/sec
Length of Train (Distance) = Speed * Time
(50/3) * 6 = 100 meter The answer is (C).
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question: Sum of the local value and the face value of 4 in the numeral 153489216 is
Options:
(A) 40004
(B) 4004
(C) 4000004
(D) 400004
(E) 44
answer:
Stream of consciousness: (Local value of 4) + (Face value of 4) = (400000 + 4) = 400004 The answer is (D).
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