Answer: (C)
Question: At 15:00 there were 20 students in the computer lab. At 15:03 and every three minutes after that, 3 students entered the lab. If at 15:10 and every ten minutes after that 9 students left the lab, how many students were in the computer lab at 15:44 ?
Options:
(A) 7
(B) 14
(C) 25
(D) 27
(E) 30
[CoT]: [Initial no of students + 3 * (1 + No of possible 3 minute intervals between 15:03 and 15:44) -
8 *(1 + No of possible 10 minute intervals between 15:10 and 15:44)
20 + 3*14 -8 * 4 = 25]

Answer: (B)
Question: A 160 meter long train crosses a man standing on the platform in 9 sec. What is the speed of the train?
Options:
(A) 96 kmph
(B) 64 kmph
(C) 52 kmph
(D) 86 kmph
(E) 76 kmph
[CoT]: [S = 160/9 * 18/5 = 64 kmph]

Answer: (B)
Question: Look at this series: 36, 34, 30, 28, 24, ... What number should come next?
Options:
(A) 20
(B) 22
(C) 25
(D) 24
(E) 26
[CoT]: [This is an alternating number subtraction series. First, 2 is subtracted, then 4, then 2, and so on.]

Answer: (A)
Question:
How much 60% of 50 is greater than 40% of 30?
Options:
(A) 18
(B) 28
(C) 29
(D) 11
(E) 12
[CoT]: [(60/100) * 50 (40/100) * 30
30 - 12 = 18]