Ages of A and B are in the ratio of a: 5. And after the (a + 3) years the age of the A is equal to the present age of B. If the age of C is 20% more than the age of the B. Then fins the age of D if the average of A, B, C and D is 30. Age of A is less than the age of B and the difference between present the age of A and B is 7
1
30
2
15
3
25
4
22
5
18