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- Question
- 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
- Correct Answer
- Rs . 420
ExplanationLet 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 - 1. 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
- 2. The average of 5 consecutive number is n , if the next two number are also include, the average of 7 number will?
Options- A. Increase by 2
- B. increase by 1
- C. Remains the same
- D. Increase by 1.4 Discuss
- 3. The average temperature of Monday, Tuesday, Wednesday, and Thursday was 38° C and that of Tuesday, Wednesday, Thursday and Friday was 40° C, if the temperature on Monday was 30° C, the temperature of Friday was?
Options- A. 40°
- B. 39°
- C. 38°
- D. 30° Discuss
- 4. The average of 25 results is 18, that of first twelve is 14 and of last twelve is 17 . Thirteenth result is?
Options- A. 28
- B. 72
- C. 78
- D. 85 Discuss
- 5. The average of 13 result is 68. The average of first seven is 63 and that of the last seven is 70 , the seventh result is?
Options- A. 47
- B. 65.5
- C. 73.5
- D. 94 Discuss
- 6. 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
- 7. 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
- 8. 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
- 9. 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 Discuss
- 10. 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
Average problems
Search Results
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: increase by 1
Explanation:
Sum of 5 consecutive integers
x + ( x +1 ) + ( x +2 ) + ( x + 3 ) + ( x +4 ) = 5n
? 5x + 10 = 5n
? x = ( n ? 2 ) ......(i)
Average of 7 consecutive integers
= [( 5x + 10 ) + ( x + 5 ) + ( x + 6 )] / 7
= 7x + 21 / 7
= x + 3 .....(ii)
from eq. (i) and (ii)
New average = x + 3 = ( n ? 2 + 3 ) = n + 1
So , the new average increases by 1 .
Correct Answer: 38°
Explanation:
From question
M + T + W + TH = 4 x 38° = 152°
? T + W + TH =152° ? 30° = 122°
Again from question
? T + W + TH + F = 4 x 40° = 160°
? F = 160° ? 122°
= 38°
Correct Answer: 78
Explanation:
Thirteenth Result = sum of all 25 results - sum of first 12 results - sum of last 12 results.
= 25 x 18 - 12 x 14 ? 12 x 17
=78
Correct Answer: 47
Explanation:
Seventh Result = sum of first 7 results + sum of last 7 results - sum of all 13 results.
? Seventh Result = (7 x 63) + (7 x 70) - (13 x 68 )
=47
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: 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: 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: 15 years
Explanation:
Increase 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
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
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