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פּוֹפּוּלָרִי Word Problems >

THe average class size at a Middle School is 21 students which is 30% smaller than it was a decade ago. What was the average class size then?

פתרון

T He a v er a g e c l a ss s i ze a t a M i dd l e S c h oo l i s 21 s t u d e n t s w hi c h i s 30% s ma ll er t han i t w a s a d ec a d e a g o . Wha t w a s t h e a v er a g e c l a ss s i ze t h e n ?

פתרון

Amount before reduction : 30

צעדי פתרון

Translate the problem into an equation:

21 = x - 0.3 x

21 = x - 0.3 x : x = 30

Amount before reduction : 30

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