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A bag consists of red and green marble. 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

Given, Total marbles in the bag = 20

The number of red marbles = 8.

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

The sum of red and green marbles is equal to the total number of marbles = 8 + x

According to the question:

8 + x = 20

=> x = 20 - 8

=> x = 12

Thus, the number of green marbles = 12

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