The amount of paint Maria used is:
Then, she has 4 - 2 2/5 pints remaining.
(I replaced 4 by 3 5/5)
The amount of paint Emma used is
Then, she has 4 - 3 = 1 pint remaining
The total remaining paint is 1 3/5 + 1 = 2 3/5 pints
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