q: The edge of a cube is 2a cm. Find its surface?
Options:
(A) 23a2 cm2
(B) 84a2 cm2
(C) 64a2 cm2
(D) 24a2 cm2
(E) 14a2 cm2
a: Stream of consciousness: 6a2 = 6 * 2a * 2a = 24a2 The answer is (D).

question: A train of 24 carriages, each of 60 meters length, when an engine also of 60 meters length is running at a speed of 60 kmph. In what time will the train cross a bridge 1.3 km long?
Options:
(A) 2 mins 14 sec
(B) 2 mins 34 sec
(C) 168 sec
(D) 344 sec
(E) 2 mins 44 sec
answer: Stream of consciousness: D = 25 * 60 + 1300 = 2800 m
T = 2800/60 * 18/5 = 168 se The answer is (C).

q: Find the average of all the numbers between 6 and 34 which are divisible by 5.
Options:
(A) 22
(B) 20
(C) 288
(D) 277
(E) 21
a: Stream of consciousness: Average = (10 + 15 + 20 + 25 + 30)/5 = 100/5 = 20. The answer is (B).

question: Find the amount on Rs.8000 in 9 months at 20% per annum, if the interest being compounded quarterly?
Options:
(A) Rs.1261
(B) Rs.9261
(C) Rs.9621
(D) Rs.9162
(E) Rs.9164
answer: Stream of consciousness: A = 8000(21/20)3 = 9261 The answer is (B).

q: In what time a sum of money double itself at 7% per annum simple interest?
Options:
(A) 33 1/8%
(B) 33 1/3%
(C) 14 2/7%
(D) 33 4/3%
(E) 73 1/3%
a: Stream of consciousness: P = (P*7*R)/100
R = 14 2/7% The answer is (C).

q: A boy runs 200 metres in 72 seconds. What is his speed ?
Options:
(A) 10 km/hr
(B) 14 km/hr
(C) 20 km/hr
(D) 12 km/hr
(E) 24 km/hr
a:
Stream of consciousness: 200/72 * 18/5 = 10 km/hr The answer is (A).