Komal's age after 17 years will be 6 years less than twice her present age. The respective ratio between Preeti's present age and Anushika's present age is 21: 19. If Anushika's age 31 years hence will be same as three times Komal's present age, what will be Preeti's age 4 years hence?

Let Komal's present age be k. After 17 years: k + 17 = 2k - 6, giving k = 23. Preeti:Anushika = 21:19, so let their ages be 21x and 19x. Anushika's age 31 years hence (19x + 31) equals 3 × Komal's present age (3 × 23 = 69). Solving 19x + 31 = 69 gives x = 2. Preeti's present age = 21 × 2 = 42. Therefore, Preeti's age 4 years hence = 42 + 4 = 46 years.