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Answer the following chemistry problem. Report the volume to the nearest gallon of hydrochloric acid.

How many gallons of 10% hydrochloric acid must be mixed with how many gallons of 90% hydrochloric acid to make 620 gallons of a 25% hydrochloric acid solution?


The number of gallons of 10% hydrochloric acid needed is gallons.
The number of gallons of 90% hydrochloric acid needed is gallons.