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x+x+1+x+5=21
3x+6=21/-6
3x=15/:3
x=5
Basia ma 5 lat, Ola ma 6 lat a Krzyś 10
x+4- wiek Krzysia
x-1- wiek Basi
x+x+4+x-1= 21
3x= 21-3
3x= 18
x= 6
x-1= 5
Odp: Basia ma 5 lat.
x+x+4+x-1=21
3x=18
x=6
Odp. basia ma 5 lat