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y-wiek Oli
x=y+6
x-4=2(y-4)
x=y+6
y+6-4=2y-8
x=y+6
2+8=2y-y
x=y+6
10=y
x=10+6
x=16
y=10
y- wiek Oli
x-4= 2( y-4)
x= y + 6
y + 6 - 4= 2y -8
y - 2y = -8 -6 +4
-1y = -10
y = 10
x= 10 +6
x= 16
odp. Karol ma 16 lat a Ola 10.
zad.2
2+ 3 =5
5 ----- 25
2 ----- x
x= 2 *25 ÷5
x= 10
odp. w klasie jest 10 dziewcząt.