Algebra practice question

Answer: 48

(3/4)b = 18 gives b = 24, and (1/2)g = 12 gives g = 24, so the class has 48 pupils.

Common wrong answers

If you answered 30

30 is the number who play, not the class size.

If you answered 36

36 is 24 + 12, mixing the girls who play with the total boys.

If you answered 40

40 comes from a slip in one of the two divisions.

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