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A bag consists of red and green marble. There are 20 marbles in the bag of which 8 are red in colour. Find the number of green marbles.

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answer is A.

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Detailed Solution

Total marbles in bag = 20

Number of red marbles = 8 .

Now let's assume number of green marbles = x.

So, x + 8 = 20

=> x = 20 - 8

=> x = 12.

So, number of green marbles = 12.

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