In a school of 450 boys, 44% of Muslims, 28% Hindus, 10% Sikhs and the remaining of other communities. How many belonged to the other communities?
Options:
(A) 72
(B) 75
(C) 80
(D) 81
(E) 90 Stream of consciousness:
44 + 28 + 10 = 82%
100 82 = 18%
450 * 18/100 = 81
Thus, the answer is (D).