Problems on Ages - General Questions

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?

7 years ago, A was 3 times as old as B. A is now 22 years older than B. What is B's present age?

2 years ago, A was 4 times as old as B. A is now 42 years older than B. What is B's present age?

The sum of the ages of two brothers is 62 years and the elder is 12 years older than the younger. What is the age of the elder brother?

5 years ago, A was 3 times as old as B. A is now 12 years older than B. What is B's present age?