The ratio of present ages of Ratna and Shantanu is 5:4. After 19 years, the ratio of their ages will be 10:9. What is Ratna's present age?

A is 4 years younger than B. B is 12 years younger than C. 4 years hence the ratio between C and A is 9:5, Find the age of B.

The average age of x and y is 18 years. If z is equal to 9 years the average of x, y and z is -

The age of a mother 10 years ago was thrice the age of her son. 10 years hence, the mother's age will be twice that of 9 her son. The ratio of their present ages is :

3 years ago, the ratio of Maya’s and Shikha’s age was 5:9 respectively. After 5 years, this ratio would become 3:5. Find present age of Maya?

Two years ago, the ratio of the age (in years) at A and B was 2:3. The ratio of their respective ages, three years from now, will be 3:5. What will be the ratio of respective ages of A and B, 6 years from now?

The average weight of 15 students of a class increases by 1.5 kg when a student of 40 kg is replaced by a new student. What is the weight (in kg) of the new student?

The average age of three boys is 18 years and their age ratio is 2: 3: 4, then what is the age of the youngest boy?