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- Question
- The sum of seven numbers is 235. The average of the first three is 23 and that of the last three is 42. The fourth number is?
Options- A. 40
- B. 126
- C. 69
- D. 195
- Correct Answer
- 40
ExplanationSum of 7 numbers = sum of first 3 numbers + N4 + sum of last 3 numbers.
(23 x 3) + N4 + (42 x 3) = 235
? N4 = 40
? 4th number = 40 - 1. Out of three number, the first is twice the second and is half of the third. If the average of the three number is 56, the three number on order are?
Options- A. 48, 96, 24
- B. 48, 24, 96
- C. 96, 24,48
- D. 96, 48, 24 Discuss
- 2. The average age of A, B , C, D five years ago was 45 years . by including P, the present average age of all the five is 49 years . the present age of P is?
Options- A. 64 years
- B. 48 years
- C. 45 years
- D. 40 years Discuss
- 3. A batsman has a certain average runs for 11 innings . In the 12th innings he made a score of 90 runs and thereby decrease his average by 5 . His average after 12th innings is?
Options- A. 127
- B. 145
- C. 150
- D. 217 Discuss
- 4. The average consumption of petrol for a car for seven months is 110 litres and for next five months it is 86 litres. The average monthly consumption is?
Options- A. 96 litres
- B. 98 litres
- C. 100 litres
- D. 102 litres Discuss
- 5. A ship sails out to a mark at the rate of 15 kmph. and sails back at the rate of 10 kmph. The average rate of sailing is?
Options- A. 5 km/hr
- B. 12 km/hr
- C. 12.5 km/hr
- D. 25 km/hr Discuss
- 6. Find the average of the following set of scores 253, 124, 255, 534, 836, 375, 101, 443, 760
Options- A. 427
- B. 413
- C. 141
- D. 490 Discuss
- 7. Find the average of the following set of scores. 124, 856, 331, 227, 963, 338, 259, and 662
Options- A. 570
- B. 660
- C. 141
- D. 350 Discuss
- 8. Find the average of all prime numbers between 60 and 90.
Options- A. 72
- B. 74.7
- C. 74
- D. 73.6 Discuss
- 9. The average of nine numbers is 50. The average of the first five numbers is 54 and that of the last three numbers is 52. Then the sixth number is
Options- A. 34
- B. 24
- C. 44
- D. 30 Discuss
- 10. The Average of six observation is 12. The average decreases by 1 when a new observation is included. What is the seventh observation?
Options- A. 1
- B. 3
- C. 5
- D. 6 Discuss
Average problems
Search Results
Correct Answer: 48, 24, 96
Explanation:
Let the numbers be 2y, y and 4y
? Average = (2y + y + 4y)/3
? 7y/3 = 56
? y = (3 x 56) / 7 = 24
Hence , the number in order are 48, 24 and 96
Correct Answer: 45 years
Explanation:
Present age of P = [(49 x 5 ) - (4 x 45 + 4 x 5 ) ] years
= 45 years.
Correct Answer: 145
Explanation:
Let the average for first 11 innings is y
From question
11y + 90 = (y - 5) x 12
? y = 150
? Average after 12th inning = (150 - 5)= 145
Correct Answer: 100 litres
Explanation:
Average = ( sum of consumption of petrol in first 7 months + sum of consumption of petrol in last 5 months. ) / 12
Average = ( 110 x 7 + 86 x 5 ) / 12
=(1200 / 12 = 100 liters
Correct Answer: 12 km/hr
Explanation:
Average = ( 2uv / u +v ) km/hr
= ( 2 x 15 x 10 ) / (15 +10 ) km/hr.
= 12 km/hr.
Correct Answer:
Explanation:
Required average = (Sum of all scores) / (Number of scores)
= (235 + 124 + 255 + 534 + 836 + 375 + 101 + 433 + 760)/9
= 3681/9= 409
Correct Answer:
Explanation:
Required average = ( Sum of scores) / (No of scores)
= (124 + 856 + 331 + 227 + 963 + 338 + 259 + 662)/8
= 3760/8 = 470
Correct Answer: 74.7
Explanation:
Average of all prime numbers between 60 and 90
= (61 + 67 + 71 + 73 + 79 + 83 + 89)/7
= 523/7 = 74.7
Correct Answer: 24
Explanation:
Required number = (Sum of all numbers) - [(Sum of first 5 numbers) + (Sum of last 3 numbers)
= 50 x 9 - ( 54 x 5 + 3 x 52)
= 450 - (270 + 156) = 450 - 426 ? 24
Correct Answer: 5
Explanation:
Total of 6 observation = 6 x 12 = 72
Total of 7 observation (including the 7th) = 7 x (12 - 1) = 77
? 7th observation = 77 - 72 = 5
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