The difference between the present ages of A and D is 14 years. Seven years ago, the ratio of their ages was 5 : 7 respectively. What is D's present age?

A 56 years

B 49 years

C 58 years

D 45 years

Solution

Correct Answer: Option A

মনে করি ,
7 বছর পূর্বে A এর বয়স ছিল =5x বছর
                 D "        "      '     =7x বছর
অতএব ,বর্তমানে A এর বয়স =(5x+7)বছর
               "           D "        "  =(7x+7) বছর
প্রশ্নমতে ,(7x+7)-(5x+7) =14
          বা,2x=14
        বা, x =7
অতএব, D এর বর্তমান বয়স =7x+7
                                      =49+7 =56 বছর।

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