please jwb pakai cara no 5 aja

misal nyoman=x tigor=y
x = 2y
(x + 10) + (y + 10) = 50

2y + 10 + y + 10 = 50
3y + 20 = 50
3y = 50 - 20
3y = 30
y = 30/3
y = 10 (usia tigor)

x = 2y
x = 2 (10)
x = 20 (usia nyoman)

jadi selisih usia mereka 20 - 10 = 10 tahun