SOLUTION: How do I solve this word problem: A student needs 10% hydrochloric acid for a chemistry experiment. How much 3% acid should be mixed with 140ml of 20% acid to get a 10% solution?

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Question 976463: How do I solve this word problem: A student needs 10% hydrochloric acid for a chemistry experiment. How much 3% acid should be mixed with 140ml of 20% acid to get a 10% solution?
Answer by josgarithmetic(39617) About Me  (Show Source):
You can put this solution on YOUR website!
x mililiters needed

%28140%2A20%2B3%2Ax%29%2F%28x%2B140%29=10