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José: (3/8)X
Hermano: X
Dentro de 4 años
José: (3/8)X + 4
Hermano: X + 4
• 3/8 X + 4= 1/2(X+4)
2(3/8 X +4)=X+4
6/8 X +8=X+4
(6X+64)/8=X+4
6X+64=8(X+4)
6X+64=8X+32
64-32=8X-6X
32=2X
16=X Edad actual de su hermano