The age of father 10 years ago was thirce the age of his son.Ten years hence,father’s age will be twice that of his son.The ration of their present ages is : Choose the correct choice from the following choices:  A) 5:2  B) 7:3  C) 9:2  D) 13:4  E) None of these
Solution   Let the ages of father and son 10 year ago be 3x and x years respectively.   Then,(3x + 10)+10 = 2[(x +10)+10 ⇔ 3x + 20 = 2x + 40 ⇔ x =20.   ∴ Required ratio =(3x +10) : (x + 10) = 70 : 30 : 7 : 3. Answer 7:3
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The age of father 10 years ago was thirce the age of his son.Ten years hence,father’s age will be twice that of his son.The ration of their present ages is :