question: Which oif the following is a prime number?
Options:
(A) 45
(B) 39
(C) 27
(D) 33
(E) 31
answer: Stream of consciousness: Clearly, 31 is a prime number. So choice E is correct. The answer is (E).

q: If rupee one produces rupees nine over a period of 40 years, find the rate of simple interest?
Options:
(A) 22 1/7%
(B) 22 7/2%
(C) 29 1/2%
(D) 22 1/2%
(E) 22 1/3%
a: Stream of consciousness: 9 = (1*40*R)/100
R = 22 1/2 % The answer is (D).

question: Average age of 9 members of a club is 29 years. If 2 more persons with the average age of 40 years have become the members of the club, find average age of all the 11 members.
Options:
(A) 15
(B) 31
(C) 77
(D) 99
(E) 22
answer: Stream of consciousness: Average age of 9 members = 29 years; Excess age of 2 new members = (40 - 29) 2 = 22 years
Therefore, Increase in the average age on inclusion of 2 new members = 22112211 = 2 years
Therefore, Average age of 11 members = 29 + 2 = 31 years The answer is (B).

q: A computer factory produces 4032 computers per month at a constant rate, how many computers are built every 30 minutes assuming that there are 28 days in one month?
Options:
(A) 2.25.
(B) 3.00.
(C) 4.5.
(D) 5.225.
(E) 6.25.
a: Stream of consciousness: Number of hours in 28 days = 28*24
Number of 30 mins in 28 days = 28*24*2
Number of computers built every 30 mins = 4032/( 28*24*2) = 3 The answer is (B).

question: If 10 % of an electricity bill is deducted, 45 is still to be paid. How much was the bill?
Options:
(A) 50
(B) 60
(C) 55
(D) 70
(E) None of these
answer: Stream of consciousness: Let the bill be x. Then
90% of x = 45
x = 45100/90 = 50 The answer is (A).

question: How many seconds will a train 100 meters long take to cross a bridge 250 meters long if the speed of the train is 36 kmph?
Options:
(A) 54 sec
(B) 35 sec
(C) 25 sec
(D) 45 sec
(E) 24 sec
answer:
Stream of consciousness: D = 100 + 250 = 350
S = 36 * 5/18 = 10 mps
T = 350/10 = 35 sec The answer is (B).