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y - kasety Agnieszki
x+y=36
x+0.1y = 0.9y => x= 0.8y
x+y=36
{
x = 0.8 y
0.8y+y=36
1.8y=36/ :1.8
y=20
36-20=16
x= 16
ODP: Monika ma 16, a Agnieszka 20 :D Pozdro :)