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umur adi = x
umur budi = y
(x - 4) : (y - 4) = 5 : 7
7x - 28 = 5y - 20
7x - 5y = 8 ...(1)
(x + 4) + (y + 4) = 64
x + y = 56 ...(2)
eliminasi:
5x + 5y = 280
7x - 5y = 8
___________ +
12x = 288
x = 24
y = 32
umur adi saat ini adalah 24 tahun