x - ilość banknotów 200zł
y - ilość banknotów 50zł
200x+50y=12000
y+10=x
y=x-10
200x+50(x-10)=12000
200x+50x-500=12000
250x=12500 /:250
x=50
y=50-10
y=40
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x - ilość banknotów 200zł
y - ilość banknotów 50zł
200x+50y=12000
y+10=x
200x+50y=12000
y=x-10
200x+50(x-10)=12000
y=x-10
200x+50x-500=12000
y=x-10
250x=12500 /:250
y=x-10
x=50
y=x-10
x=50
y=50-10
x=50
y=40