Many of the problems on the ACT Math test — 40% of the problems, in fact — are categorized as Pre-Algebra and Elementary Algebra. These problems test things like averages, ratios, proportions and the like. Often times, students think that because these topics are so basic, they don’t need to review them. But the makers of the ACT find clever ways of testing these seemingly “easy” topics.

Consider the following problem involving averages:

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