Q: Four of the following five parts numbered (a), (b), (c), (d) and (e) are exactly equal. The number of the part which is not equal to the other four parts is your answer.
Options:
(A) 85 17 110
(B) 45 6 + 75 4
(C) 175 25 75 + 5(2)
(D) 36 4 + 21(2) 7 5
(E) 65 12 46 5
A: OK... Stream of consciousness: Except it, others are equal to 550.
The answer is (B).

Q: In a school of 700 boys, 44% of Muslims, 28% Hindus, 10% Sikhs and the remaining of other communities. How many belonged to the other communities?
Options:
(A) 173
(B) 126
(C) 153
(D) 143
(E) 133
A: OK... Stream of consciousness: 44 + 28 + 10 = 82%
100 82 = 18%
700 * 18/100 = 126
The answer is (B).

Q: There are 8 books in a shelf that consist of 1 paperback books and 7 hardback books. If 4 books are selected at random without replacement, how many different combinations are there that at least one paperback book is selected?
Options:
(A) 35
(B) 45
(C) 50
(D) 55
(E) 60
A: OK... Stream of consciousness: 8C4 [Select any four] - 7C4 [Select all hard backs] = 35.
The answer is (A).

Q: The no. of girls in a class are 7times the no. of boys, which value cannever be the of total students?
Options:
(A) 20
(B) 35
(C) 30
(D) 40
(E) 42
A:
OK... Stream of consciousness: Let the boys are X, then girls are 7X, total = X+7X = 8X
So it should be multiple of 8, 30 is not a multiple of 8.
The answer is (C).