please help!

[shizuka4762]

rubbing alcohol is sold in two concentrations: 40 % and 60%. if eight litres are mixed together, producing a 55% concentration, how many litres of each strength are used?

 

[Deleted member 4993]

rubbing alcohol is sold in two concentrations: 40 % and 60%. if eight litres are mixed together, producing a 55% concentration, how many litres of each strength are used?

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