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The number of boys in a class is three times the number of girls. Which one of the following numbers cannot represent the total number of children in the class?

Correct Answer: 42

Explanation:

Let number of girls = x and number of boys = 3x.

Then, 3x + x = 4x = total number of students.

Thus, to find exact value of x, the total number of students must be divisible by 4.

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