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- Question
- 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
- Correct Answer
- 49
ExplanationFifth result = sum of all five result - sum of first four result.
= 5 x 46 - 4 x 45
= 230 -180
=50 - 1. The average of first nine multiples of 3 is?
Options- A. 12.0
- B. 12.5
- C. 15.0
- D. 18.5 Discuss
- 2. 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
- 3. If a, b, c, d, e are five consecutive odd number , their average is?
Options- A. 5 (a + 4)
- B. abcd/5
- C. 5 (a + b + c + d + e)
- D. None of these Discuss
- 4. The average height of 30 girls out of a class of 40 is 160 cms and that of the remaining girls is 156 cms. the average height of the whole class is?
Options- A. 11.8
- B. 25
- C. 29.5
- D. 30 Discuss
- 5. The average score of a cricketer for 10 matches is 43.9 runs. If the average for the first six matches is 53 , the average for the last four matches is?
Options- A. 17.15
- B. 29.75
- C. 30.25
- D. 31 Discuss
- 6. 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
- 7. 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
- 8. 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 Discuss
- 9. 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
- 10. 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
Average problems
Search Results
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: None of these
Explanation:
Since a, b, c, d, e are 5 consecutive numbers so
b = a + 2.
c = a + 4.
d = a + 6.
e = a + 8.
Average = (a + b + c + d + e)/ 5
= [a + (a + 2 ) + (a +4 ) + (a+6 )+ (a+8)] / 5
= (5a+20) / 5
= a + 4
Correct Answer: 30
Explanation:
Average height of the whole class = sum of height of 40 girls / 40
= (30 x 160 + 10 x 156) / 40
= 159 cms.
Correct Answer: 30.25
Explanation:
Let the average for last 4 matches be y.
Sum of score for 10 matches = sum of score for first 6 matches + sum of score of last 4 matches.
So 53 x 6 + 4y = 10 x 43.9
? 4x= 439-318
?4x= 121
? x= 30.25
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: 0.642025
Explanation:
Average = (0.64204 + 0.64203 + 0.64202 + 0.64201)/ 4
=2.5681/ 4
=0.642025
Correct Answer: 31kg
Explanation:
weight 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
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
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