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Umur Ibu = x
Umur Ayah = y
x = 2/3y
y = 3/2x
x + y = 55
Masukkan y,
x + y = 55
x + 3/2x = 55
5/2x = 55
x = 55 : 5/2
x = 55 x 2/5
x = 22
Masukkan x,
x + y = 55
22 + y = 55
y = 55 - 22
y = 33
Maka,
y - x = 33 - 22 = 11
Jadi, selisih umur Ibu dan Ayah adalah 11 tahun