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- Question
A family consists of grandparents, parents and three grandchildren. The average age of the grandparents is 67 years, that of the parents is 35 years and that of the grandchildren is 6 years. What is the average age of the family ?
Options- A. 31( 5/7)
- B. 32 (6/7)
- C. 34(4/7)
- D. 35(4/9)
- Correct Answer
- 31( 5/7)
ExplanationRequired average = (67 * 2 + 35 * 2 + 6 * 3) / (2 + 2 + 3)
= (134 + 70 + 18) / 7 = 222 / 7 = 31(5/7) years.
- 1. When all the students in a school are made to stand in rows of 54, 30 such rows are formed. If the students are made to stand in rows of 45, how many such rows will be formed ?
Options- A. 22
- B. 36
- C. 32
- D. 26 Discuss
- 2. A batsman scores 26 runs and increases his average from 14 to 15. Find the runs to be made if he wants top increasing the average to 19 in the same match ?
Options- A. 74
- B. 79
- C. 72
- D. 60 Discuss
- 3. The average of the two-digit numbers, which remain the same when the dibits inter-change their positions, is :
Options- A. 53
- B. 54
- C. 55
- D. 56 Discuss
- 4. In a class of 100 students, the average weight is 30 kg. If the average weight of the girls is 24 kg and that of the boys is 32 kg, then what is the number of girls in the class?
Options- A. 25
- B. 26
- C. 27
- D. 28 Discuss
- 5. 20 men went to a restaurant. Ninteen of them paid Rs.70 each and the twentieth man paid Rs.90.25 more than the average of all the 20 men. What is the total bill ?
Options- A. Rs. 1495
- B. Rs. 548
- C. Rs. 850
- D. Rs. 1750 Discuss
- 6. Of the following, which is greater than ½ ? Indicate ALL such fractions.
Options- A. 2/5
- B. 4/7
- C. 4/9
- D. 5/11 Discuss
- 7. The average of a non-zero number and its square is 11 times the number. The number is ?
Options- A. 22
- B. 21
- C. 11
- D. 17 Discuss
- 8. Amithab's average expenditure for the January to June is Rs. 4200 and he spends Rs.1200 in January and Rs.1500 in july.The average expenditure for the months of febraury to July is:
Options- A. Rs. 4250
- B. Rs. 4520
- C. Rs. 4060
- D. None of these Discuss
- 9. Out of the five integral numbers C is the average of A and D. B is greater than C and less than D.Also B is the average of A and E . The middle most number in the sequence
Options- A. A
- B. B
- C. C
- D. D Discuss
- 10. In a cinema hall for the matinee show which started at 2.30 pm and ended at 5.30 pm the vehicle parking lot had only three wheelers (auto rickshaws) and four wheelers. Today the wheels of the vehicles parked was counted and found to be 240. What could be the number of three wheelers parked therein ?
Options- A. 48
- B. 41
- C. 45
- D. 43 Discuss
Average problems
Search Results
Correct Answer: 36
Explanation:
Total number of students = 54 x 30
When arranged in rows of 45, number of rows formed are,
= 36.
Correct Answer: 74
Explanation:
Number of runs scored more to increse the ratio by 1 is 26 - 14 = 12
To raise the average by one (from 14 to 15), he scored 12 more than the existing average.
Therefore, to raise the average by five (from 14 to 19), he should score 12 x 5 = 60 more than the existing average. Thus he should score 14 + 60 = 74.
Correct Answer: 55
Explanation:
Average = (11 + 22 + 33 + 44 + 55 + 66 + 77 + 88 + 99) / 9
=( (11 + 99) + (22 + 88) + (33 + 77) + (44 + 66) + 55) / 9
= (4 * 110 + 55)/9 = 495 / 9 = 55.
Correct Answer: 25
Correct Answer: Rs. 1495
Explanation:
Let the average bill paid by twenty members = 'x'
But 19 men paid each = Rs. 70
20th man paid Rs. 90.25 more than the avg bill of 20 = x + 90.25
20x = 19(70) + x + 90.25
19x = 1330 + 90.25
19x = 1420.25
x = 1420.25/19 = Rs. 74.75
But the total bill = 20 x 74.75 = Rs. 1495.
Correct Answer: 4/7
Explanation:
One way to deal with fractions is to convert them all to decimals.
In this case all you would need to do is to see which is greater than 0.5.
Otherwise to see which is greater than ½, double the numerator and see if the result is greater than the denominator. In B doubling the numerator gives us 8, which is bigger than 7.
Correct Answer: 22
Explanation:
Let the number be 'x'.
= 11x
= 22x
=> x = 22.
Correct Answer: Rs. 4250
Explanation:
Amithab's total expenditure for Jan - June = 4200 x 6 = 25200
Expenditure for Feb - June = 25200-1200 = 24000
Expenditure for the months of Feb - July = 24000 + 1500 =25500
The average expenditure = 25500/6 = 4250
Correct Answer: B
Explanation:
D _ C _ A --------(1)
D > B > C --------(2)
from (1) and (2)
D > B > C > A ---------(3)
Again E _ B _ A
But B > A, from (3)
So E > D > B > C > A [ Since B is the average of E and A so it is eqidistant from both E and A]
Correct Answer: 48
Explanation:
3X + 4y = 240
by substitute through options 48 is correct
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