The contents of a bag of marbles consist of 12 green marbles and 20 blue marbles. How many blue marbles must be removed so that 40% of the marbles in the bag will be green?	Choose the correct choice from the following
A) 0 B) 1 C) 2 D) 3 E) 4
We can use simple arithmetic to solve this problem by testing our answers.   Lets test B:   If we only remove 1 blue marble:   12 green marbles and 19 blue marbles for a total of 31 marbles   12/31=37.5% not quite our answer.   Lets test 2:   If we remove 2 blue marbles:   12 green marbles and 18 blue marbles for a total of 30 marbles   12/30=40%   2 is our answer!
<result>C</result>
The contents of a bag of marbles consist of 12 green marbles and 20 blue marbles. How many blue marbles must be removed so that 40% of the marbles in the bag will be green?