SOLUTION: How many milliliters of 30% acid solution need to be added to 55 mL of 50% acid solution that is 40% acid?

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Question 1145795: How many milliliters of 30% acid solution need to be added to 55 mL of 50% acid solution that is 40% acid?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
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How many milliliters , x, of L% acid solution need to be added to Y mL of H% acid solution that is T% acid?
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unknown variable x

%28Lx%2BHY%29%2F%28x%2BY%29=T
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Lx%2BHY=Tx%2BTY
HY-TY=Tx-Lx
highlight%28x=Y%28%28H-T%29%2F%28T-L%29%29%29
Substitute your given values and evaluate x.

Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
.
How many milliliters of 30% acid solution need to be added to 55 mL of 50% acid solution highlight%28cross%28that%29%29 highlight%28cross%28is%29%29 to get a 40% acid soultion?
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Without solving any equations, each and every housewife, based on her common sense, will answer you :

        55 mL of 50% acid solution has to be added and mixed.