Tolong bantu ya no6, terima kasih;)

Misal
X → ayah
Y → anak
...
x-5/y-5 = 7/1
x-5 = 7y-35
x = 7y-30 ...(1)

x+3 + y+3 = 56
x+y = 50
(7y-30)+y = 50
8y = 80
y = 10

Umur anak 10 tahun