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The third part is 4/15.

1 - (1/3 + 2/5) = 1 - (5/15 + 6/15) = 1 - 11/15 = 4/15

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14y ago
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Q: A square is in 3 parts part a is one third of the area part b is two fifths of the area what fraction of the area is the third part?
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