how do i solve this?

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What quantity of 10% acid solution must be mixed with 180 mL of 60% acid solution to produce 40% acid solution?


May 11th, 2015

What quantity of 10% acid solution must be mixed with 180 mL of 60% acid solution to produce 40% acid solution?

10% of x + 60% of 180 = 40% of ( x + 180 )

1/10 x + 108 = 4/10 x + 72

36 = 3/10 x

x = 120


May 11th, 2015

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