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The average age of 30 boys in a class is 15 years. One boy, aged 20 years, left the class, but two new boys came in his place whose ages differ by 5 years. If the average age of all the boys now in the class becomes 15 years, the age of the younger new comer is:

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Important Questions on Ratio and Proportion

MEDIUM
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
Seven children with the same date of birth were born in seven consecutive years. The sum of the ages of the three oldest children is 63 years. What will be the sum of the ages for the three youngest children? 
EASY
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
A man retired from his service at the age of 60. He served for 35th years of his retirement age. He joined his job at the age of:
EASY
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
The sum of the ages of Jelena and Jaden is 70 years. Five years ago, Jaden’s age was twice that of Jelena. What is the current age of Jaden?
MEDIUM
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
The ratio of the ages of A, B and C is 5:8:9. If the sum of the ages of A and C is 56 years, the age of B will be:
EASY
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
The ratio of the present ages of X and Y is 3:4 Five years ago, the ratio of their ages was 5:7. What is the present age of Y? 
MEDIUM
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
The ratio of the age of a father and his son is 3:1. If the product of their ages is 432, then what is the sum of their ages?
EASY
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages

A father’s age is four times the age of son. After 20 years his age will remain only twice that of his son. Find out their ages.

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Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
Seven years ago, the ratio of the ages of A and B was 4:5. Eight years hence, the ratio of the ages of A and B will be 9:10. What is the sum of their present ages in years? 
EASY
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
The age of father is twice that of the elder son. After ten years, the age of father will be three times that of the younger son. If the difference of ages of the two sons is 15 years, the age of the father is?
MEDIUM
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
The present age of Rohit is 6 years less than 3.5 times that of Nishant. Next year Nishant’s age will be one-third the age of Rohit. What is the present age of Rohit? 
MEDIUM
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
The ratio of the ages of A and B, 8 years ago, was 2:3. Four years ago, the ratio of their ages was 5:7. What will be the ratio of their ages 8 years from now?
MEDIUM
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
5 years ago, the average age of P and Q was 15 years. At present, the average age of P, Q and R is 20 years. What will be the average age of P, Q and R after 10 years?
MEDIUM
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
The ages of A and B are in the ratio 5:7. Five years ago, their ages were in the ratio 5:8. The respective present ages (in years) are:
MEDIUM
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
The present age of Manoj is twice the sum of the ages of his two children. After 20 years, the age of Manoj will become equal to the sum of the ages of his two children. What is the present age of Manoj?
MEDIUM
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
5 years ago, the ratio of the age of A to that of B was 4:5. Five year hence, the ratio of the age of A to that of B will be 6:7. If, present, C is 10 years younger than B, then what will be the ratio of the present age of A to that of C?
MEDIUM
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
The present ages of A and B are in the ratio 3 : 4. Twelve years ago, their ages were in the ratio 2 : 3. The sum of the present ages of A and B (in  years) is:
EASY
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
Seven years ago, the ages (in years) of A and B were in the ratio 4:5 and 7 years hence, their ages will be in the ratio 5:6. What will be the ratio of their ages 5 years from now?
MEDIUM
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages
The ratio of the ages of A, B and C is 5:8:9. If the sum of the ages of A and C is 56 years, find the age of B.
EASY
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages

The ratio of the current age of X and Y is 5 : 4. Three years from now the ratio of their age will be 11 : 9. What is the present age of Y?

EASY
Numerical and Mental Ability Test>Arithmetic>Ratio and Proportion>Problems Based on Ages

Surya is 25 years older than his son. In 5 years, he will be twice as old as his son. What will be Surya's age after 3 years?