# Infirmary

Two thirds of children from the infirmary went on a trip seventh went to bathe and 40 children remained in the gym. How many children were treated in the infirmary?

Correct result:

x =  210

#### Solution:

2/3x + 1/7 x + 40 = x

2/3•x + 1/7•x + 40 = x

4x = 840

x = 210

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