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y dzieci
80x+40y=20000
x+y=300
x=300-y
80(300-y)+40y=20000
x=300-y
24000-80y+40y=20000
x=300-y
y=100
x=300-100=200
y=100
było 200 dorosłych i 100 dzieci
Pzdr:)
80x+40y=20000
-80x-80y=-24000
80x+40y=20000
-40y=-4000
y=100
x+100=300
x=200
x-dorośli
y-dzieci