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3/10 of the marbles in a box are red and 2/5 of them are blue. If 9/10 of the marbles in a box are red, blue, green, what fraction of the the marbles are green

Sagot :

9/10-(3/10+2/5)
9/10-(3/10+4/10)
9/10-7/10
=2/10 = 1/5
Red
3/10
Blue
2/5
All
9/10

9/10-7/10=2/10 Or 1/5