Divide 4/5 gallon by 3/8 gallon:
4
--
5 4 8 32
==== = --- * ---- = -------
3 5 3 15
8
Note that 32/15 yields 2 2/15. Thus, 2 containers received 3/8 gallons of paint each, and 1 was partially filled (with 2/15 gallon).
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