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maka x - 11x + y + 11 y = 12 jadi -10x + 12 y = 12
x = 7/6 y
umur ibu = y
jadi -10(7/6)y + 12 y = 12
-35/3 y + 12 y =12
1/3 y = 12
y = 36
umur ayah = x
x = 7/6 y
x = 7/6 (36)
= 42
maka 5 tahun yg akan datang ayah = 42+5= 47
dan umur ibu = 41