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Red:Green = 3:1

So, lets consider there are 30 red marbles and 10 green marbles in the bowl
(which only contains 2 colors of marbles)
Since we need the ratio of Green marbles to the total of all the marbles.
Total marbles = Red + Green = 10+30
Ratio of Green : Total = 10:40 = 1:4(Option B)
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