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

How many gallons of 30% hydrochloric acid must be mixed with how many gallons of 70% hydrochloric acid to make 500 gallons of a 47% hydrochloric acid solution?

The number of gallons of 30% hydrochloric acid needed is gallons.

The number of gallons of 70% hydrochloric acid needed is gallons.