Discussion
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- Question
- The average weight of A, B, C is 45kg. if the average weight of A and B be 40 kg and that of B and C be 40kg and that of B and C be 43kg, then the weight of B is?
Options- A. 17kg
- B. 20kg
- C. 26kg
- D. 31kg
- Correct Answer
- 31kg
Explanationweight of (A + B ) = (2 X 40 ) Kg = 80 kg
weight of (B + C ) = (2 X 43) kg = 86 kg
weight of (A + 2B +C ) = (80 + 86) kg = 166 kg
weight of (A + B + C ) = (3 X 45) kg = 135 kg
weight of B = (166-135) kg = 31 kg
- 1. The average of numbers 0.64204, 0.64203, 0.64202 and 0.64201 is?
Options- A. 0.64202
- B. 0.64204
- C. 0.642022
- D. 0.642025 Discuss
- 2. The average of 30 results is 20 and the average of other 20 results is 30 . what is the average of all the results?
Options- A. 24
- B. 25
- C. 48
- D. 50 Discuss
- 3. The average of five results is 46 and that of the first four is 45. the fifth result is?
Options- A. 51
- B. 50
- C. 49.5
- D. 49 Discuss
- 4. The average of first nine multiples of 3 is?
Options- A. 12.0
- B. 12.5
- C. 15.0
- D. 18.5 Discuss
- 5. Out of three numbers, the first is twice the second and is half of the third. If the average of three number is 56, the three number in order are?
Options- A. 48, 96, 24
- B. 48, 24, 96
- C. 96, 24, 48
- D. 96, 48, 24 Discuss
- 6. The average weight of 19 students is 15kg. by the admission of a new student the average weight is reduced to 14.8 kg. the weight of the new student is?
Options- A. 10.6 kg
- B. 10.8 kg
- C. 11 kg
- D. 14.9 kg Discuss
- 7. The average weight of 8 persons is increased by 2.5 kg, when one of them whose weight is 56 kg is replaced by a new man. The weight of the man is?
Options- A. 66 kg
- B. 75 kg
- C. 76 kg
- D. 86 kg Discuss
- 8. The average of the daily income of A, B and C is Rs . 60 . If B earns Rs . 20 more than C and A earns double of what C earns. What is the daily income of C?
Options- A. Rs. 70
- B. Rs. 60
- C. Rs. 40
- D. None of these Discuss
- 9. The average age of an adult class is 40 years. 12 new students with an average age of 32 years join the class. Therefore decreasing the average by 4 year. what was the original strength of class?
Options- A. 10
- B. 11
- C. 12
- D. 15 Discuss
- 10. In a class, there are 20 boys whose average age is decreased by 2 months, when one boy aged 18 years is replaced by a new boy. The age of the new boy is?
Options- A. 14 years 8 months
- B. 15 years
- C. 16 years 4 months years
- D. 17 years 10 months years Discuss
Average problems
Search Results
Correct Answer: 0.642025
Explanation:
Average = (0.64204 + 0.64203 + 0.64202 + 0.64201)/ 4
=2.5681/ 4
=0.642025
Correct Answer: 24
Explanation:
Sum of 50 result = sum of 30 result + sum of 20 result.
= 30 x 20 + 20 x 30
= 1200
Correct Answer: 49
Explanation:
Fifth result = sum of all five result - sum of first four result.
= 5 x 46 - 4 x 45
= 230 -180
=50
Correct Answer: 15.0
Explanation:
Average = ( 3 + 6 + 9 + 12 + 15 + 18 + 21 + 24 + 27 ) / 9
= 3(1+2+3+4+5+6+7+8+9)/9
= ( 45 / 3 )
= 15
Correct Answer: 48, 24, 96
Explanation:
Let second number = x
So, first number = 2x and third number= 4x
? ( x + 2x + 4x ) / 3 = 56
? 7x = 168
? x = 24
So the numbers are 48,24, 96,
Correct Answer: 11 kg
Explanation:
Weight of new student = Total weight of all 20 students - Total weight of initial 19 students
= (20 x 14.8 - 19 x 15) kg
= 11 kg.
Correct Answer: 76 kg
Explanation:
Total Increase = 8 x 2.5 = 20 kg.
weight of new man = (56 + 20) kg = 76 kg
Correct Answer: Rs. 40
Explanation:
Let C's earning = Rs. y.
Then, B's earning = Rs. (y + 20)
and A's earning = Rs. 2y
? 2y + y + 20 + y= 3 x 60
? 4x = 160
? x = 40
Correct Answer: 12
Explanation:
Let original strength = y
Then , 40y + 12 x 32 = ( y + 12) x 36
? 40y + 384 = 36y + 432
? 4y = 48
? y = 12
Correct Answer: 14 years 8 months
Explanation:
Total decrease
= ( 20 X 2 ) months
= 3 years 4 month
? Age of the new boy
= ( 18 years ) ? ( 3 years 4 months)
= 14 years 8 month
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