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- Question
The average age of a class of 39 students is 15 years. If the age of the teacher is included, then the average increases by 3 months. Find the age of the teacher.
Options- A. 30
- B. 25
- C. 35
- D. 40
- Correct Answer
- 25
- 1. The average age of 36 students in a group is 14 years. When the teacher's age is included in it, the average increases by one. The teacher's age in years is
Options- A. 31
- B. 51
- C. 36
- D. D) Discuss
- 2. The sum of ages of 4 children born at intervals of 4 years each is 60. What is the age of the youngest child?
Options- A. 7
- B. 9
- C. 10
- D. 12 Discuss
- 3. The average age of 19 boys in a class is 21 years. If the teacher's age is included, the average increases to 22 years. What is the teacher's age?
Options- A. 39 years
- B. 41 years
- C. 40 years
- D. 44 years Discuss
- 4. The average of the ages of Rajan and his son is 20. If Rajan's present age is three times the age of his son, then what will be the age of Rajan 5 years from now?
Options- A. 40 years
- B. 28 years
- C. 35 years
- D. 25 years Discuss
- 5. The ratio of present ages of P and Q is 7:9. Before 10 years the ratio of their ages was 5:7. What is Q's present age (in years)?
Options- A. 35
- B. 45
- C. 25
- D. 55 Discuss
- 6. The average age of A and B is 18 years. After 3 years, C joins them and the average ages of A, B and C becomes 22 years. The age of C is ?
Options- A. 20 years
- B. 21 years
- C. 24 years
- D. 23 years Discuss
- 7. A man was 32 years of age when he had his first son. His wife was 35 years of age when his son attained the age of 7 years. The difference between the age of the father and the mother is _____
Options- A. 7 years
- B. 3 years
- C. 5 years
- D. 4 years Discuss
- 8. The sum of present age of father and his son is 60 yrs. Six years ago, father's age was five times the age of the son. After 6 years, son's age will be?
Options- A. 45
- B. 25
- C. 20
- D. 33 Discuss
- 9. What is the place value of 6 in 64?
Options- A. 6
- B. 60
- C. 64
- D. 10 Discuss
- 10. In a two-digit number, the digit in the unit's place is more than twice the digit in ten's place by 1. If the digits in the unit's place and the ten's place are interchanged,difference between the newly formed number and the oiginal number is less than the original number by 1. What is the original number ?
Options- A. 35
- B. 36
- C. 37
- D. 39 Discuss
Problems on Ages
Search Results
Correct Answer: 51
Correct Answer: 9
Correct Answer: 41 years
Correct Answer: 35 years
Correct Answer: 45
Correct Answer: 24 years
Correct Answer: 4 years
Correct Answer: 20
Correct Answer: 60
Explanation:
We know that,
? Each digit has a fixed position called its place.
? Each digit has a value depending on its place called the place value of the digit.
? The face value of a digit for any place in the given number is the value of the digit itself
? Place value of a digit = (face value of the digit) × (value of the place).
Hence, the place value of 6 in 64 = 6 x 10 = 60.
Correct Answer: 37
Explanation:
Let the ten's digit be x. Then, unit's digit = 2x + 1.
[10x + (2x + 1)] - [{10 (2x + 1) + x} - {10x + (2x + 1)}] = 1
<=> (12x + 1) - (9x + 9) = 1 <=> 3x = 9, x = 3.
So, ten's digit = 3 and unit's digit = 7. Hence, original number = 37.
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