75% of all the boys and 48% of all the girls at Smith High School take civics. If there are 20% fewer boys than there are girls in the school, what percent of all the students take civics?

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What this question tests

Your ability to compute percentage change, percentage of a whole, and to work backwards from a final value.

Treating successive percentage changes as additive — a 10% rise then a 10% fall is not back to the start.