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N = anak
3N = A
A - N = 40
3N - N = 40
2N = 40
N = 20
[cmiiw]
x = 3y
x-y = 40
3y-y = 40
2y = 40
y = 20
umur anak = 20
umur ayah = 3y = 3 x 20 = 60
*x=umur ayah
y = umur anak