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A a-4 a
B b-4 b
a-4=2(b-4)
a-4=2b-8
a=2b-4.......(I)
3/4 x a = b + 15
3/4 x (2b-4) = b + 15
6b-12= 4b+60
2b=72
b=36 años
3/4 x a = 36 + 15
a = 51 x 4 / 3
a= 68 años
respuesta: A tiene 68 años y B 36 años