Sonu is 24 years younger than Sushil. Sonu's age is 30% of the sum of his and Sushil's age. What will be sushil's age after 7 years ?

49

30%= \(\frac{3}{10}\)

      Sonu : Sushil  :  Sum    :  Difference

         3    :     7     :    10     :        4

                                                    ↓ x6

                                                  24 (given) 

⇒ 1R  = 6

Sushil's age at present = 6 × 7 = 42 years

Sushil's age after 9 years = 42 + 7 = 49 years