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

How many liters of 15% carbonic acid must be mixed with how many liters of 30% carbonic acid to make 670 liters of a 21% carbonic acid solution?

The number of liters of 15% carbonic acid needed is liters.

The number of liters of 30% carbonic acid needed is liters.