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40l-100%
Xl- 21%
X= (40*21)/100= 84/10= 8,4 l.
b)
240l-100%
Xl- 21%
X=(240*21)/100=504/10=50,4l
21% - x l
_____________
x=40*21/100
x=8,4
b)100% - 240l
21% - x l
________________
x=240*21/100
x=50,4