At present the ratio between the ages of Arun and Deepak is 5:7. After 6years, Arun's age will be 36 years. What is the age of Deepak at present?  Choose the correct choice from the following answers: A) 35 years B) 25 years C) 42 years D) 39 years E) 40 years

Rationale: "let the present ages of arun and deepak be 5 x years and 7 x years respectively 5 x + 6 = 36 5 x = 30 x = 6 deepak ' s age = 7 x = 42 years answer is c"
Answer: C