Discussion

Explanation:

Given, total number of students = 150

Number of girls who have not studied Math = 60% of 60% of 150 = 54.

Total number of students who have not studied Math = 50% of 150 = 75.

∴ Number of boys who have not studied Math = 75 – 54 = 21.

Total number of boys = 40% of 150 = 60.

∴ percentage of boys who have studied Math = (60 - 21)/60 × 100 = 65%

Hence, option (a).

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