Respuesta :

Answer:

Four

Step-by-step explanation:

If 2/5 of the marbles are red that’s equivalent to 4/10, if 1/10 is blue that means 5/10 are left over that are green. That means half the marbles are green, so 20 x 2 is 40. One tenth of forty is 4. Therefore, four marbles are blue.

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