The no. of girls in a class are 7times the no. of boys, which value cannever be the of total students?\nOptions:\n(A) 20\n(B) 35\n(C) 30\n(D) 40\n(E) 42
Let’s work this out in a step by step way to be sure we have the right answer.
(C)
Let the boys are X, then girls are 7X, total = X+7X = 8X\nSo it should be multiple of 8, 30 is not a multiple of 8.

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Thus, the answer is (C)