Question : The ratio of the present ages of the two boys is $3:4$. After 3 years, the ratio of their ages will be $4:5$. The ratio of their ages after 21 years will be:

Option 1: $14:17$

Option 2: $17:19$

Option 3: $11:12$

Option 4: $10:11$

Question : The average age of a man and his son is 55 years. The ratio of their ages is 7 : 4, respectively. What will be the ratio of their ages after 6 years?

Option 1: 1 : 2

Option 2: 12 : 7

Option 3: 25 : 17

Option 4: 38 : 23

Question : The ratio of the present age of the father to that of his son is 7 : 2. If after 10 years the ratio of their ages becomes 9 : 4, then the present age of the father is:

Option 1: 43 years

Option 2: 35 years

Option 3: 37 years

Option 4: 40 years

Question : Eight years ago, the ratio of the ages of A and B was 5 : 4. The ratio of their present ages is 6 : 5. What will be the sum (in years) of the ages of A and B 7 years from now?

Option 1: 80

Option 2: 102

Option 3: 112

Option 4: 90

Question : Six years ago, the ratio of ages of A to B was 7 : 5. 4 years from now, the ratio of their ages will be 11 : 9. What is A’s age at present?

Option 1: $24 \frac{1}{2}$ years

Option 2: $22 \frac{1}{2}$ years

Option 3: $23 \frac{1}{2}$ years

Option 4: $21 \frac{1}{2}$ years