Question
The average age of (x + 3) students is 20 years. When
their teacher aged 35 years joins them, the average increases by 1 year. Find x% of 400.Solution
Total age of students = 20(x + 3) years According to question, [20(x + 3) + 35] = (20 + 1)(x + 3 + 1) 20x + 60 + 35 = 21x + 84 20x + 95 = 21x + 84 21x – 20x = 95 – 84 x = 11 So, 11% of 400 = 44
A father is three times as old as his son. After 5 years, the father’s age will be twice that of his son. What are their current ages?
- The age ratio of Kiran and Meena 3 years ago was 3:4. In 9 years from now, the ratio of their ages will be 5:6. What is the present age of Meena?
Aarav's current age is 6 years less than the total of 30% of Neel’s age and 50% of Tarun’s age. If Neel is 70 years old and Tarun is 40 years old, h...
A’s age is 120% of what he was 4 years ago, But 30% of what it will be after 5 years. What is his present age?
Ayush's current age is 25% greater than Ayushi's, and the difference between their ages is 8 years. What will be the ratio of their ages 8 years from now?
A father is four times as old as his son. In 10 years, the father will be twice as old as his son. What is the son’s present age?
10 years ago, the age of ‘P’ was 50% more than the age of ‘Q’. If the sum of their present ages is 75 years, find the present age of ‘P’.
- Five years ago, the ratio of ages of 'X' and 'Y' was 2:3, respectively. Seven years from now, the ratio of their ages will be 4:5, respectively. If 'Z' is ...
Ten years ago, the average age of A and B was 12 years. The average age of A, B and C now is 22 years. What will be C’s age after 20 years?
The average of the current ages of Ram and his father is 44 years. In six years, Ram's age will be half of his father's age four years ago. What is the ...
Relevant for Exams:
