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4(a+2) = b+2+36
a-3 = 2b-6
a = 2b-6+3
a = 2b-3
4(2b-3+2) = b+38
4(2b-1) = b+39
8b-4 = b+38
8b-b = 38+4
7b = 42
b = 6
a = 2b-3
a = 2(6)-3
a = 12-3
a = 9
jumlah umur keduanya:
a+b = 9+6
= 15