Question 864705
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Hi
 {{{x + (2/5)x = 42}}}     |Multiplying thru by 5 so as all denominators = 1
 5x + 2x = 210
    7x = 210
     x = 30, girls and 12 boys {{{(2/5)30}}}
and...checking!
 30 + 12 = 42