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

How many gallons of 35% carbonic acid must be mixed with how many gallons of 85% carbonic acid to make 520 gallons of a 73% carbonic acid solution?

The number of gallons of 35% carbonic acid needed is gallons.

The number of gallons of 85% carbonic acid needed is gallons.