q: A sells a bicycle to B at a profit of 20%. B sells it to C at a profit of 25%. If C pays Rs. 225 for it, the cost price of the bicycle for A is?
Options:
(A) 277
(B) 268
(C) 270
(D) 150
(E) 282
a: Stream of consciousness: 125% of 120% of A = 225
125/100 * 120/100 * A = 225
A = 225 * 2/3 = 150. The answer is (D).

question: The average of first 15 natural numbers is?
Options:
(A) 7
(B) 8
(C) 9
(D) 10
(E) 11
answer: Stream of consciousness: Sum of 15 natural no. = 240/2 = 120
Average = 120/15 = 8 The answer is (B).

q: The speed of a train is 90 kmph. What is the distance covered by it in 10 minutes?
Options:
(A) 15
(B) 66
(C) 77
(D) 52
(E) 42
a: Stream of consciousness: 90 * 10/60 = 15 kmph The answer is (A).

question: If six persons sit in a row, then the probability that three particular persons are always together is -.
Options:
(A) 1/5
(B) 1/7
(C) 1/9
(D) 1/2
(E) 2/7
answer: Stream of consciousness: 3!4! Required probability = 3!4!/6! = 1/5 The answer is (A).

q: In what time will a railway train 50 m long moving at the rate of 36 kmph pass a telegraph post on its way?
Options:
(A) 5 sec
(B) 4 sec
(C) 3 sec
(D) 6 sec
(E) 1 sec
a: Stream of consciousness: T = 50/36 * 18/5 = 5 sec The answer is (A).

q: The number N is 5,H48, where H represents the hundred's digit. If N is divisible by 11, what is the value of H
Options:
(A) 1
(B) 7
(C) 6
(D) 5
(E) 2
a:
Stream of consciousness: If the number is divisible by 11, then the alternate digits' sum must be divisible by 11 or difference is 0. Only 1 yields such a number. The answer is (A).