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- Question
- The average weight of 8 men is increased by 2kg when one of the men whose weight is 50 kg is replaced by a new man . The weight of the new man is?
Options- A. 52 kg
- B. 58 kg
- C. 66 kg
- D. 68 kg
- Correct Answer
- 66 kg
ExplanationWeight increase = 8 x 2 kg = 16 kg
weight of new man= 50 + 16 = 66 kg - 1. The average salary per head of all the workers in a workshop is Rs. 850, if the average salary per head of 7 technician is Rs. 1000 and the average salary per head of the rest is Rs 780, the total number of workers in the work- shop is?
Options- A. 18
- B. 20
- C. 22
- D. 24 Discuss
- 2. The average earning of a mechanic for the first-four days of a week is Rs. 18 and for the last four days is Rs. 22. If he earns Rs . 20 on the fourth day, his average earning for the whole week is?
Options- A. Rs . 18.95
- B. Rs 16
- C. Rs. 20
- D. Rs. 25.71 Discuss
- 3. The average of three number is 42. The first is twice the second and the second is twice the third the different between the third largest and the smallest number number is?
Options- A. 18
- B. 36
- C. 54
- D. 72 Discuss
- 4. The ratio of ages of the father and the daughter at present is 3 : 1. Four year ago the ratio was 4 : 1 . The average age of the father and daughter 2 year hence will be
Options- A. 24
- B. 26
- C. 25
- D. 36 Discuss
- 5. Last year Sahara, Tata, Singhania and Birla each has 250 industries. This year everyone has sold out 10 factories due to the recession of the economy and poor turnout. The average number of industries which of them now has
Options- A. 260
- B. 240
- C. 25
- D. none of these Discuss
- 6. The average weight of a class of 40 students is 40 kg. If the weight of the teacher be included , the average weight increases by 500 gm . The weight of the teacher is?
Options- A. 40.5 kg
- B. 60 kg
- C. 60.5 kg
- D. 62 kg Discuss
- 7. The average age of four players is 18.5 years. If the age of the coach is also included, the average age increases by 20%. The age of the coach is?
Options- A. 28 years
- B. 31 years
- C. 34 years
- D. 37 years Discuss
- 8. The average age of four children in a family is 12 years. If the spacing between their ages is 4 years, the age of the youngest child is?
Options- A. 6 years
- B. 7 years
- C. 8 years
- D. 9 years Discuss
- 9. In a T.V. factory, an average of 60 TVs are produced per day for the fist 25 days of the months. A few workers fell ill for the next five days reducing the daily average for the month to 58 sets per day . The average production per day for day last 5 days is?
Options- A. 45
- B. 48
- C. 52
- D. 58 Discuss
- 10. The average of marks obtained by 120 candidates was 35. If the average of marks of passed candidates was 39 and that of failed candidates was 39 and that of failed candidates was 15, the number of candidates who passed the examination is?
Options- A. 100
- B. 110
- C. 120
- D. 150 Discuss
Average problems
Search Results
Correct Answer: 22
Explanation:
Let the total number of workers be y.
So sum of salary for all workers = sum of salary of 7 technician + sum of salary for other y -7 workers.
7 x 1000 + 780(y -7) = 850 y
? 7000 + 780y - 5460 = 850y
? 70y = 1540
? y = 22
So total number of workers = 22
Correct Answer: Rs. 20
Explanation:
Total earning for the week = Sum of earning of first four days + Sum of earning of last four days - Earning of 4th day
= 4 x18 + 4 x 22 -20
= Rs. 140
? Average earning = 140 / 7
= Rs. 20
Correct Answer: 54
Explanation:
Let third number = y
Then, second number = 2y
and first number =4y
? ( y + 2y + 4y) / 3 = 42
? 7y = 42 x 3
? y = 18
so, (largest) - (smallest) = ( 4y - y)
= 3y
=54
Correct Answer: 36
Explanation:
Let the present ages of father be 3x and daughter be x .
so the 4 year ago father's age and daughter's age was
( 3x - 4 ) and ( x - 4 )
? ( 3x - 4 / x -4 ) = 4 / 1
? x = 12 year and 3x = 36 year
Correct Answer: 240
Explanation:
Required average
= Old average - Sold average
= ( 250 ) - ( 10 ) = 240
Correct Answer: 60.5 kg
Explanation:
Weight of the teacher = Total weight of 40 students and teacher - total weight of 40 students
= 41 x 40.5 - 40 x 40 kg
= 60.5kg
Correct Answer: 37 years
Explanation:
New average = 120% of old average
=120% of 18.5
= (120 x 18.5) / 100
= 22.2
Age of coach = Total weight of 4 players and coach - total weight of 4 players
= 5 x 22.2 - 4 x 18.5
= 37 years
Correct Answer: 6 years
Explanation:
Let the age of youngest child be y.
so from question y + (y + 4) + (y + 8) + (y + 12) = 4 x 12
? 4y + 24= 48
? y = 6 years
Correct Answer: 48
Explanation:
Production during these 5 days = Total production in a month - production in first 25 days.
= 30 x 58 - 25 x 60
= 240
? Average for last 5 days = 240 / 5
= 48
Correct Answer: 100
Explanation:
Let the number of candidate who passed = y
Then, 39y + 15(120 - y) =120 x 35
? 24y= 4200 -1800
? y= 2400 / 24 = 100
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