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7x+20=2(x+20)
7x+20=2x+40
7x-2x=40-20
5x=20/:5
x=4
4*7=28
Odp: Pani ma 28 lat
Córka: y
x = 7y
x + 20 = 2 * (y + 20)
x + 20 = 2y + 40
7y + 20 = 2y + 40
5y = 20 /: 5
y = 4
x = 7 * 4
x = 28
Mama ma 28 lat, a córka 4.