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- Question
- The average age of 5 member of a committee is the same is it was 3 years ago ,because an old member has been replaced by a new member . the difference between the age of old and new member is?
Options- A. 2 years
- B. 4 years
- C. 8 years
- D. 15 years
- Correct Answer
- 15 years
ExplanationIncrease in sum of age during 3 years = 3 x 5 years
= 15 years
So , the difference between ages of old and new member is 15 years - 1. The mean temperature of Monday to Wednesday was 37° C and of Tuesday to Thursday was 34° C . If in the temperature on Thursday was 4/5 th that of Monday, what was temperature on Thursday?
Options- A. 34° C
- B. 35.5° C
- C. 36° C
- D. 36.5° C Discuss
- 2. Ten years ago the average age of a family of 4 members was 24 years. Two children having been born average age of the family is same today. What is the present age of the youngest child if they differ in age by 2 years?
Options- A. 1 year
- B. 2 years
- C. 3years
- D. 5 years Discuss
- 3. The average age of a husband and a wife was 23 year when they were married 5 year ago. The average age of the husband, the wife and child, who was born during the interval is 20 years now . How old is the child now?
Options- A. less then 1 year
- B. 1 year
- C. 3 year
- D. 4 year Discuss
- 4. There were 35 students in a hostel. If the number of students increased by 7, the expenses of the mess were increase by Rs 42 per Day , while the average expenditure per head diminished by Re. 1 The original expenditure of the mess was?
Options- A. Rs. 40
- B. Rs . 420
- C. Rs . 432
- D. Rs . 442 Discuss
- 5. A man whose bowling average is 12.4 takes 5 wicket for 26 runs and thereby decreases his average by 0.4. The number of wickets taken by him, before his last match is?
Options- A. 85
- B. 78
- C. 72
- D. 64 Discuss
- 6. The average age of 11 players of a cricket is decreased by two month when two of them aged 17 years and 20 years are replaced by two reserves . the average of the reserves is?
Options- A. 17 years 1 month
- B. 17 years 7 month
- C. 17 years 11 months
- D. 18 years 3 months Discuss
- 7. 5 years ago, the average of Ram and Shyam age was 20 years. now, the average age of Ram , Shyam and Mohan is 30 years . what will be Mohan's age 10 years hence?
Options- A. 45 years
- B. 50 years
- C. 49 years
- D. 60 years Discuss
- 8. The average of A and B is 20 years. If C were to replace A, the average would be 19 and if C were to replace B, the Average would be 21. What are the ages of A, B and C?
Options- A. 22, 18, 20
- B. 18, 22, 20
- C. 20, 22, 18
- D. 18, 20, 22 Discuss
- 9. What will be the average of even numbers between 11 to 63.
Options- A. 37.5
- B. 47
- C. 42
- D. 37 Discuss
- 10. Calculate the average of the cubes of first five natural numbers.
Options- A. 55
- B. 65
- C. 45
- D. 35 Discuss
Average problems
Search Results
Correct Answer: 36° C
Explanation:
M + T + W = 3 x 37 = 111° C .....(1)
T + W + Th = 3 x 34 = 102 ° C ......(ii)
Let M = y
Then, Th = 4y/5
subtraction (ii) from (i) we get,
M - Th = 9° C
? y - 4y / 5 = 9° C
? y = 45° C
? Temperature on thursday = (4 x 45) / 5° C
= 36° C
Correct Answer: 3years
Explanation:
Let the age of youngest child be y.
Then y + ( y + 2 ) = ( 24 x 6 ) - ( 24 x 4 + 4 x 10)
= 144 - 136
? 2y + 2 = 8
? y =3 years
Correct Answer: 4 year
Explanation:
Age of child = sum of age of husband , wife and child - sum of age of husband and wife.
= [(20 x 3) - (23 x 2 + 5 x 2)] years
= 4 years.
Correct Answer: Rs . 420
Explanation:
Let the original expenditure be Rs. y per day ,
Then, y / 35 - [( y + 42 ) / 42 ] = 1
? 42y - 35 ( y + 42 ) = 35 x 42
? 7y = 35 x 42 + 35 x 42
? y = ( 2 x 35 x 42 ) / 7
= 420
Hence , the original expenditure is Rs . 420
Correct Answer: 85
Explanation:
Let the number of wickets taken before the last match = y
Bowler's overall average = total run scored / total wicket taken by bowler
Then, (12.4y + 26 ) / (y + 5) = 12
? x = 85
Correct Answer: 17 years 7 month
Explanation:
Decrease in sum of age = 11 x 2 months
= 1 year 10 months
Total age of reserves = (17 + 20 ) years - (1 year 10 month)
= 35 years 2 months
Average age of the reserves = (35 years 2 months ) / 2
= 17 years 7 months
Correct Answer: 50 years
Explanation:
Total age of Ram and shyam 5 years ago
= 2 x 20 = 40 years
? Total age of Ram and Shyam at present
= 40 + 5 + 5 = 50 years
Mohan's age now =90 - 50 years = 40 years
Mohan's age 10 years hence = 40 + 10 years
= 50 years
Correct Answer: 20, 22, 18
Explanation:
Let a, b, c are the ages of A, B and C respectively
a + b = 2 X 20 = 40 ...(1)
b + c = 2 x 19 = 38 ...(2)
c + a = 2 x 21 = 42 ...(3)
Adding all the 3 equalities
2a + 2b + 2c = 120
a + b + c = 60 --- (4)
From eq. (2) and (4)
a = 22
From eq. (1) and (4)
b = 18
From eq. (4)
c= 20
? Age of A = 22 years
Age of B = 18 years
Age of C = 20 years
Correct Answer: 37
Explanation:
Even numbers between 11 to 63
= 12,14,16,18,20,..........,62.
Clearly, this is a series of consecutive even number
According to the formula
Average of consecutive even numbers = (First number + Last number)/2
= (12 + 62)/2
= 74/2
= 37
Correct Answer: 45
Explanation:
As per the formula,
Average of the cubes os 1st 'n' natural numbers= n(n+1)2/4
where, n= 5.
? Required average = 5(5+1)2/4
= (5 x 36)/4 = 5 x 9= 45
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