Bunuel wrote:

Over the past year, did the number of male students in the school increase?

(1) Over the past year, the ratio of number of male students to the total number of students increased.

(2) Over the past year, the total number of students increased.

S1 - \(\frac{No. of male students}{Total no. of students}\) increased

Therefore, either no. of male students increased or total no. of students decreased.

Insufficient.

S2 - Total no. of students increased

No. of Male students could increase or remain constant.

Insufficient.

Combining S1+S2, Ratio increased and total no. of students also increased.

Hence no. of male students must increase.

Sufficient.

Answer C.

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