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Kasia = x
tata = 8x
za 2 lata
Kasia = x+4
tata = 8x+4
4(x+4) = 8x+4
4x+16 = 8x+4
4x-8x = 4-16
-4x = -12 |:(-4)
x = 3
2 lata temu
Kasia = 3
tata = 8*3 = 24
odp:
obecnie:
Kasia ma 3+2 = 5 lat
tata ma 24+2 = 26 lat