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- Question
- 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
- Correct Answer
- 54
ExplanationLet 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 - 1. 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
- 2. 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
- 3. In a class, there are 80 students and their average marks in the annual examination are 40. If the average marks of passed students are 60 and average marks of failed students are 35, then find out the number of students who failed.
Options- A. 63
- B. 60
- C. 72
- D. 64 Discuss
- 4. If the average age of Dinesh and Mahesh is 16 yr, the average age of Mahesh and Rahul is 13 yr and the average age of Dinesh and Rahul is 14 yr, then what is the age of Mahesh?
Options- A. 15 yr
- B. 20 yr
- C. 58 yr
- D. 16 yr Discuss
- 5. The average age of women and child workers in a factory was 15 yr. The average age of all the 16 children was 8 yr and average age of women workers was 22 yr. If 10 women workers were married, then the number of unmarried women workers was.
Options- A. 16
- B. 12
- C. 8
- D. 6 Discuss
- 6. 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
- 7. 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
- 8. 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 Discuss
- 9. 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
- 10. 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
Average problems
Search Results
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: 64
Explanation:
Let the number of failed student = Y
? Number of passed student = 80 - Y
sum of marks of all students = sum of marks of passed students + sum of marks of failed students
80 x 40 = (80 - Y) x 60 + 35Y
? 3200 =4800 - 60Y + 35Y
? 25Y = 1600
? Y = 64
? Number of students who failed = 64
Correct Answer: 15 yr
Explanation:
Let ages of Dinesh, Mahesh and Rahul be D, M and R, respectively.
Then,
D + M = 2 x 16 = 32 ...(i)
M + R = 2 x 13 = 26 ....(ii)
D + R = 2 x14 = 28 ....(iii)
On adding Eqs. (i), (ii) and (iii), we get
2(D + M + R) =86
? D + M + R = 43 ....(iv)
On subtracting Eqs. (iii) from Eq. (iv), we get
M = 43 - 28
? M = 15 Yr
Correct Answer: 6
Explanation:
Let the number of women workers be Y.
Then, 22y + 16 x 8 = 15 (16+y)
? 22y + 128 = 240 + 15y
? 22y - 15y= 240 - 128
? y = 16
? Unmarried women workers = 16 - 10 = 6
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: 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: 66 kg
Explanation:
Weight increase = 8 x 2 kg = 16 kg
weight of new man= 50 + 16 = 66 kg
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
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