A, B से 4 वर्ष बड़ा है और C से 4 वर्ष छोटा है, जबकि B और D जुड़वां हैं। C, D से कितने वर्ष बड़ा है?

The ratio of the age (in years) of A one year ago to that of B one year hence is 2:3. Also, the ratio of the age (in years) of A five years hence to that of B four years hence will be 4:5. What will be the ratio of respective ages of A and B 8 years from now?

The present ages of Rohit and his father are in the ratio 2 : 5. Four years from now, the ratio of their ages will become 12 : 27. What was the father's age (in years) five years ago from now?