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y - ilosc chlopcow
x+y=160
1/3x+2/7y=46 /*(-3)
x+y=160
-x-6/7y= - 138
------------------- +
1/7y=22 /*7
y=154
x=160-154=6
Odp. Ten test pisalo 6 dziewczat i 154 chlopcow.