Algebra practice question

Answer: 72

m − m/3 − 12 = m/2 gives 2m/3 − 12 = m/2, so m/6 = 12 and m = 72.

Common wrong answers

If you answered 24

24 is m/3, the amount spent on the book.

If you answered 36

36 comes from m/3 + 12 = m/2 with m/6 = 6, a slip in the 12.

If you answered 48

48 is the amount left after the book, before lunch.

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