[Ans] (C)
[Question] Find the C.I. on a sum of Rs.1600 for 9 months at 20% per annum, interest being compounded quarterly?
Options:
(A) 2528
(B) 2526
(C) 2522
(D) 2722
(E) 2426
[CoT] A = 1600(21/20)3 = 2522

[Ans] (C)
[Question] There are 6 chess amateurs playing in Villa's chess club tournament. If each chess amateur plays with exactly 15 other amateurs, what is the total number of chess games possible to be played in the tournament?
Options:
(A) 10
(B) 20
(C) 45
(D) 60
(E) 120
[CoT] Each person is one participant of 6 games. So there are in all 6*15 = 90 instances of one participant games. But each game has 2 participants so total number of games = 90/2 = 45

[Ans] (A)
[Question]
Ravi can do a piece of work in 30 days while Prakash can do it in 40 days. In how many days will they finish it together?
Options:
(A) 17 1/7 days
(B) 27 1/7 days
(C) 23 2/7 days
(D) 16 4/11 days
(E) none of these
[CoT] 1/30 + 1/40 = 7/120
120/7 = 17 1/7 days