Answer: (D)
Question: 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
[CoT]: [6a2 = 6 * 2a * 2a = 24a2]

Answer: (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]

Answer: (A)
Question: A man purchases 8 pens for Rs.9 and sells 9 pens for Rs.8, how much profit or loss does he make?
Options:
(A) 15
(B) 66
(C) 88
(D) 1
(E) 12
[CoT]: [90 * 10/60 = 15 kmph]

Answer: (E)
Question:
Antony, Ben, and Charles each try independently to win a carnival game. If their individual probabilities for success are 2/5, 3/8, and 2/7, respectively, what is the probability that exactly two of the three players will win but one will lose?
Options:
(A) 3/140
(B) 1/280
(C) 3/280
(D) 3/35
(E) 68/280
[CoT]: [P = P(A wins, B wins, C loses) + P(A wins, B loses, C wins) + P(A loses, B wins, C wins) = 2/5*3/8*5/7 + 2/5*5/8*2/7 + 3/5*3/8*2/7 = 68/280.]