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## Answers

## isouffront1

let x be volume of 5% acid and y be volume of the 8%

x + y = 750 and

0.05x + 0.08y = 0.07*750 = 52.5

from first equation y = 750 - x so substituting in the second equation:-

0.05x + 0.08(750 - x) = 52.5

0.05 - 0.08x = 52.5 - 60

-0.03x = -7.5

x = -7.5 / -0.3 = 250 mls <------ answer