Q11 The average age of A and B is 20 years. If C were to replace A, the average would be 19 and the average age of C and A would be 21. The ages of A, B and C respectively are:

Q12 Sachin is younger than Rahul by 7 years. If their ages are in the respective ratio of 7 : 9, how old is Sachin?

Q13 The present ages of three persons in proportions 4 : 7 : 9. Eight years ago, the sum of their ages was 56. Find their present ages (in years).

Q14 Present ages of Sameer and Anand are in the ratio of 5 : 4 respectively. Three years hence, the ratio of their ages will become 11 : 9 respectively. What is Anand's present age in years?

Q15 A is two years older than B who is twice as old as C. If the total of the ages of A, B and C be 27, then how old is B?

Q16 Q is as much younger than R as he is older than T. If the sum of the ages of R and T is 50 years, what is definitely the difference between R and Q's age?

Q17 Father is four times the age of his daughter. If after 5 years, he would be three times of daughter’s age, then further after 5 years, how many times he would be of his daughter’s age?

Q18 A and b are 50 and 70 years old how many years ago was ratio of their ages 2:3

Q19 The present age of the father is 4 years more than thrice the age of his son Three years later father's age will be 10 years more than twice the age of his son.What is the present age of father in years​

Q20 One year ago, a man was 8 times as old as his son. Now his age is equal to square of his son's age. Find their present ages.