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30
It is: 12+18+30 = 60
48
18 + 24 - 30 = 12
That one is easy it is 18 and 12
-18
18 + 12 = 30
30 - 18 = 12
Boys: 12/30 = 2/5 Girls: 18/30 = 3/5
42
18 + 12 = 30 18 - 12 = 6