The ratio between the present ages of M and N is 6 : 7. If N is 4 years old than M. What will be the ratio of the ages of M and N after 4 years?

3:4

3:5

4:3

None

Let M's age and N's age be 6x years and 7x years respectively Then, 7x - 6x = 4 or x = 4 Required ratio = (6x + 4) : (7x + 4) = 28 : 32 = 7 : 8

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