This year's graduating class at Richmond High School is 209 students, which is 90% larger than it was a generation ago. What was the size of the graduating class then?

Solución

Solución

Amount before addition : 110

Pasos de solución

Translate the problem into an equation:

209 = x + 0.9 x

209 = x + 0.9 x : x = 110

Amount before addition : 110

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