The ratio of the present ages of P and Q is 6:7. If Q is 4 years older than P, what will be the ratio of the ages of P and Q after 4 years?

Explanation

P:Q = 6:7, and their difference of one ratio unit equals 4 years. So P=24 and Q=28. Four years later they are 28 and 32: 28:32 = 7:8.