(Ans). (B)
(Question). There are 4 chess amateurs playing in Villa's chess club tournament. If each chess amateur plays with exactly 4 other amateurs, what is the total number of chess games possible to be played in the tournament?
Options:
(A) 10
(B) 8
(C) 40
(D) 60
(E) 120
(CoT). Each person is one participant of 4 games. So there are in all 4*4 = 16 instances of one participant games. But each game has 2 participants so total number of games = 16/2 = 8

(Ans). (D)
(Question). Three pipes A, B and C can fill a tank from empty to full in 20 minutes, 20 minutes and 30 minutes respectively. When the tank is empty, all the three pipes are opened. A, B and C discharge chemical solutions P, Q and R respectively. What is the proportion of solution R in the liquid in the tank after 3 minutes?
Options:
(A) 1/2
(B) 1/5
(C) 1/3
(D) 1/4
(E) 1/6
(CoT). Part filled by (A + B + C) in 3 minutes = 3(1/20 + 1/20 + 1/30) = 6/15
Part filled by C in 3 minutes = 3/30
Required ratio = 3/30 * 15/6 = 1/4

(Ans). (E)
(Question). The speed of a train is 90 kmph. What is the distance covered by it in 30 minutes?
Options:
(A) 15
(B) 66
(C) 77
(D) 52
(E) 45
(CoT). 90 * 30/60 = 45 kmph

(Ans). (E)
(Question).
What should come in place of the question mark (?) in the following equation?
45789+ 34567 = 610+ ?
Options:
(A) 96543
(B) 13678
(C) 23456
(D) 56789
(E) 79746
(CoT). 45789+ 34567 = 610+ ?
45789+ 34567 610 = 79746