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受欢迎的 Word Problems >

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?

解答

T hi s ye a r^{'} s g r a d u a t in g c l a ss a t R i c hm o n d H i g h S c h oo l i s 209 s t u d e n t s, w hi c h i s 90% l a r g er t han i t w a s a g e n er a t i o n a g o . Wha t w a s t h e s i ze o f t h e g r a d u a t in g c l a ss t h e n ?

解答

Amount before addition : 110

求解步骤

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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