Question 624743
7/5 = a/c


7/5 = (85-c)/c


7c = 5(85-c)


7c = 425-5c


7c+5c = 425


12c = 425


c = 425/12


c = 35.41666


Round to the nearest integer to get 35 children


***Note: because I'm getting a decimal answer, there might be a typo somewhere in the original problem***