(Ans). (E)
(Question). The average of first six prime numbers greater than 20 is?
Options:
(A) 10
(B) 20
(C) 30
(D) 40
(E) 34
(CoT). 23 + 29 + 31 + 37 + 41 + 43 = 204/6 = 34

(Ans). (C)
(Question). Find the invalid no.from the following series 13, 18, 25, 30, 37, 40
Options:
(A) 21
(B) 25
(C) 40
(D) 47
(E) 58
(CoT). The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong.

(Ans). (A)
(Question). A small company employs 3 men and 5 women. If a team of 3 employees is to be randomly selected to organize the company retreat, what is the probability that the team will have exactly 2 men?
Options:
(A) 5/7
(B) 1/7
(C) 2/7
(D) 3/7
(E) 1/2
(CoT). Total ways to choose 4 employees from 8 employees = 8C3
Two men = 5C2
Two women = 3C1
P = (5C2 * 3C1)/8C2 = 5/7 hence

(Ans). (D)
(Question).
Two trains are moving at 50 kmph and 70 kmph in opposite directions. Their lengths are 150 m and 100 m respectively. The time they will take to pass each other completely is?
Options:
(A) 7 1/6 sec
(B) 7 3/2 sec
(C) 7 1/7 sec
(D) 7 1/2 sec
(E) 3 3/2 sec
(CoT). 70 + 50 = 120 * 5/18 = 100/3 mps
D = 150 + 100 = 250 m
T = 250 * 3/100 = 15/2 = 7 1/2 sec