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5%x-grube ryby
80%{x-5%x)-płotki
x=5%x+80%(x-5%x)+38
x=0,05x+0,8(x-0,05x)+38
x=0,05x+0,8*0,95x+38
x=0,05x+0,76x+38
x-0,05x-0,76x=38
0,19x=38/:0,19
x=200
5%*200=0,05*200=10
odp.grubych ryb pływa 10