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y- banknoty 100 zl
600= 10* x + 1/2* 10x + 100y
19= x+ y
600= 15x+ 100y
19=x+ y
600=15x+ 100y
1900=100x+ 100y
1300= 85x
x=15
y= 19- 15= 4 - banknoty 100zl
15/3= 5-> banknotow 20 zl
15- 5= 10 banknotow 10 zl
400zl + 20*5 + 10* 10= 600zl