Explanation:

-> If the current age of ritu = 4a
and raj =3a correspondingly.
After 6 years , ritu’s age = 4a +6 years
-> After 6 years, ritu’s age will be 26 years.
4a + 6 = 26
A = (26 – 6) /4 = 5
raj’s current age is 3 x 5 = 15 years.