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

How many milliliters of 45% carbonic acid must be mixed with how many milliliters of 85% carbonic acid to make 520 milliliters of a 73% carbonic acid solution?

The number of milliliters of 45% carbonic acid needed is milliliters.

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