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

Correct answer:

x =  210

Step-by-step explanation:

32x+71x+40=x  2/3 x+1/7 x+40=x  4x=840  x=4840=210  x=210

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