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

How many drams of 85% carbonic acid must be mixed with how many drams of 15% carbonic acid to make 520 drams of a 37% carbonic acid solution?

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

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