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There are three times more children in the gym than adults. The average age of adults is 44 years. What is the average age of children if the total average age of everyone in the gym is 20?

Correct answer:

x =  12

Step-by-step explanation:

$$\begin{gathered} 3a\cdot x+a\cdot 44=20\cdot (3a+1a) \\ 3\cdot x+1\cdot 44=20\cdot (3+1) \\ 3x=36 \\ x=\frac{36}{3}=12 \\ x=12 \end{gathered}$$

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