# Math

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These review questions are stumping me.

How much water must be added to 50 ML of a 35% acid solution to produce a mixture that is 20% acid.

Could it be as simple as 15% water?

• Math -

how much acid initially?
.35*50ml= 17.5ml
How much water?
.65*60=32.5ml

.20(32.5+X)=17.5
solve for X

• Math One more thing -

I got the answer to be 55 ml, but can you please explain how you knew to do that?

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