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A bag contains 40 marbles, 4 of which are blue, 10 are red, and 1 is purple. Shawna takes a marble out of the bag, records the color, and returns it to the bag. How many green marbles should she expect after 400 trials?

A. 25

B. 40

C. 100

D. 250

Answer :

she should expect 250 marbles after 400 trials.

why:

if 25/40 is green then that means chances of pulling marbles are increasing by 10% their original number.

Also it's 250 because 25 is 63% of 40 and 250 is 63% of 400

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