Problems on Ages - General Questions

The ratio of the present ages of A and B is 6 : 5. After 13 years the ratio will be 43 : 38. What is A's present age?

The ratio of the present ages of A and B is 3 : 4. After 7 years the ratio will be 31 : 39. What is A's present age?

A father is 4 times as old as his son. After 6 years he will be 3 times as old as his son. What is the father's present age?

The sum of the ages of two brothers is 67 years and the elder is 13 years older than the younger. What is the age of the elder brother?

The sum of the ages of two brothers is 33 years and the elder is 15 years older than the younger. What is the age of the elder brother?