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płotki-80%y
y=95%*x
20%y=38
0,2y=38 /:0,2
y=190-płotki+leszcze
190=95%
x=100%
190=95%x
0,95x=190 /:0,95
x=200
5%*200=10
grube ryby - 5%*x = 0,05x
płotki - (x-0,05x)*80% = 0,95x*0,8 = 0,76x
leszcze - 38
x = 0,05x+0,76x+38
x = 0,81x+38
x-0,81x = 38
0,19x = 38 |:0,19
x = 200
grube ryby - 0,05*200 = 10
płotki - 0,76*200 = 152
leszcze - 38