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

How many quarts of 15% carbonic acid must be mixed with how many quarts of 85% carbonic acid to make 640 quarts of a 18% carbonic acid solution?

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

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