30percentage of the class are 10 yars old and the other 21 children are 11 year old how many children were the class

解

30 p erce n t a g e o f t h e c l a ss a re 10 y a rs o l d an d t h e o t h er 21 c hi l d re n a re 11 ye a r o l d h o w man y c hi l d re n w ere t h e c l a ss

Percentage : \frac{1}{3}

Class^{'} s age is : y

解答ステップ

Translate the problem into an equation:

30 x = 10

x

を解く

30 x = 10 : x = \frac{1}{3}

発見する age

Percentage : \frac{1}{3}

Class^{'} s age is : y