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

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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.

Sum of red and green marbles is equal to total number of marbles = 8 + x =20;

x = 20 - 8;

x = 12.

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