q: Find the value of y from (12)^3 x 6^4 432 = y?
Options:
(A) 3451
(B) 3467
(C) 3891
(D) 4601
(E) 5184
a: OK... Given Exp. = (12)3 x 64 = (12)3 x 64 = (12)2 x 62 = (72)2 = 5184
432 12 x 62
The answer is (E).

q: There are different 15 circles. What is the number of the greatest possible points with which the circles intersect?
Options:
(A) 390
(B) 100
(C) 110
(D) 180
(E) 210
a: OK... Maximum points of intersection between n different circles = n*(n - 1) = 15*14 = 210
The answer is (E).

q: A man started running at a distance of 225 metre from the train. If the speed of the man is 6 km/h, then how much time should the train wait so that the man will be just able to catch it ?
Options:
(A) 2 14 min
(B) 3 min
(C) 4 14 min
(D) 4 12 min
(E) None of these
a:
OK... Time = 225/6518 = 135 sec = 214 min.
The answer is (A).