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umur anak = y
x -y = 25
(x+ 5) + (y + 5) = 47
x + y + 10 = 47
x + y = 37
x - y = 25
x + y = 37
________-
-2y = -12
y = 6
x -y = 25
x- 6 = 25
x = 31
umur ibu sepuluh tahun lagi = 31 + 5 + 10 = 46 tahun
umur anak sepuluh tahun lagi = 6 + 5 + 10 = 21 tahun