At present,the ratio between the ages of Arun and Deepak is 4:3. After 6 years, Arun’s age will be 26 years. What is the age of Deepak at present ?  Choose the correct choice from the following answers: A) 12 years B) 15 years C) 19½ years D) 21 years E) None of these
Solution   Let the present ages of Arun and Deepak be 4x years and 3x years respectively.   Then, 4x +6 = 26 ⇔ 4x = 20 ⇔ x =5.   ∴ Deepak's age =3x =15 years. Answer 15 years
<result>B</result>
At present,the ratio between the ages of Arun and Deepak is 4:3. After 6 years, Arun’s age will be 26 years. What is the age of Deepak at present ?