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y-ilość kupionych drogich biletów
{x+y=400
{0,7(24y + 12x)=4200
{x=400-y
{16,8y + 8,4x=4200
16,8y + 8,4(400-y)=4200
16,8y + 3360 - 8,4y =4200
8,4y=840
y=100
x=400-y
x=400-100
x=300
{x=300
{y=100
odp . kupiono 300 tanich biletów i 100 drogich .