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4,80 zł - 1kg gruszek - y
{x+y =20
{2,40x +12= 4,80y
{x=20-y
{2,40x+12=4,80y
2,40(20-y)+12=4,80y
48-2,40y +12=4,80y
60 - 2,40y=4,80y |+2,40y
60=6y |:6
10=y
x=20-10=10
{x=10
{y=10
Odp. Kupiono 10kg jabłek i 10kg gruszek
48-12=36zł
36zł:4,80=7,5kg
odp:kupiono 20kg jabłek i 7,5 kg gruszek.