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y- ilość czekolad 25dag czyli 250g
x+y=135
100x+250y=21000
x=135-y
13500-100y+250y=21000
x=135-y
150y=7500 |:150
x=135-y
y=50
x=85
y=50
Mam nadzieję, że pomogłam ;)