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y-ilośc chłopców
1/3(jedna trzecia)x+2/7(dwie siódme)y=46 /*21
x+y=150
7x+6y=966
x+y=150 /*-6
7x+6y=966
-6x-6y=-900
________________
x=66
7(66)+6y=966
462+6y=966
6y=966-462
6y=504 /:6
y=84
x=66