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A box contains 11 marbles—7 red and 4 green. Five of these marbles are removed at random. If the probability of drawing a green marble is now 0.5, how many red marbles were removed from the box

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Zhyrasoviz
1.5 is my answer
equation-(4-0.5)-5=1.5 if the green marbles is 0.5 the red marbles was 5.5 
the total of all marbles was only 6 marbles