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

How many drams of 20% hydrochloric acid must be mixed with how many drams of 65% hydrochloric acid to make 500 drams of a 42% hydrochloric acid solution?


The number of drams of 20% hydrochloric acid needed is drams.
The number of drams of 65% hydrochloric acid needed is drams.