Averages(Quantitative Aptitude ) Questions and answers for exam Preparation

Quantitative Aptitude

AVERAGES MCQs

Averages

Total Questions : 3752 | Page 374 of 376 pages

Question 3731. The average marks in mathematics scored by the students of a school at the public examination were 39. If four of these students who actually scored 5, 12, 15 and 19 marks at the examination had not been sent up, the average marks for the school would have been 44. Find the number of students sent up for examination from the school?

Discuss Question

Answer: Option B. -> 25
39X = 5 + 12 + 15 + 19 + (X – 4)44
X = 25

Question 3732. The average age 9 members of a committee are the same as it was 2 years ago, because an old number has been replaced by a younger number. Find how much younger is the new member than the old number?

7 years
11 years
18 years
27 years

Discuss Question

Answer: Option C. -> 18 years
9 * 2 = 18 YEARS

Question 3733. The average temperature for Monday, Tuesday, Wednesday and Thursday was 48 degrees and for Tuesday, Wednesday, Thursday and Friday was 46 degrees. If the temperature on Monday was 42 degrees. Find the temperature on Friday?

40 degrees
38 degrees
36 degrees
34 degrees

Discuss Question

Answer: Option D. -> 34 degrees
M + TU + W + TH = 4 * 48 = 192
TU + W + TH + F = 4 * 46 = 184
M = 42
TU + W + TH = 192 -42 = 150
F = 184 – 150 = 34

Question 3734. A man purchased 3 blankets @ Rs.100 each, 5 blankets @ Rs.150 each and two blankets at a certain rate which is now slipped off from his memory. But he remembers that the average price of the blankets was Rs.150. Find the unknown rate of two blankets?

Rs.150
Rs.225
Rs.250
None

Discuss Question

Answer: Option D. -> None
10 * 150 = 1500
3 * 100 + 5 * 150 = 1050
1500 – 1050 = 450

Question 3735. A building contractor employs 20 male, 15 female and 5 child workers. To a male worker he pays Rs.25 per day, to a female worker Rs.20 per day and a child worker Rs.8 per day. The average wage per day paid by the contractor is__________?

Rs.20
Rs.21
Rs.22
Rs.23

Discuss Question

Answer: Option B. -> Rs.21
20 15 5
25 20 8
500 + 300 + 40 = 840/40 = 21

Question 3736. Visitors to show were charged Rs.15 each on the first day. Rs.7.50 on the second day, Rs.2.50 on the third day and total attendance on the three days were in ratio 2:5:13 respectively. The average charge per person for the whole show is___________?

Rs.3
Rs.4.50
Rs.5.00
Rs.7.50

Discuss Question

Answer: Option C. -> Rs.5.00
2: 5: 13
2X 5X 13X
15 7.5 2.5
30X + 37.5X + 32.5X = 100X/20X
AVERAGE = 5

Question 3737. In a hostel there were 100 students. To accommodate 20 more students the average is decreased by rupees 5. But total expenditure increased by Rs.400. Find the total expenditure of the hostel now?

Rs.5000
Rs.4600
Rs.5400
Rs.2300

Discuss Question

Answer: Option C. -> Rs.5400
100X + 400 = 12(X – 5)
X = 50
100 * 50 + 400 = 5400

Question 3738. A batsman in his 17th innings makes a score of 85 and their by increasing his average by 3. What is his average after the 17th innings?

Discuss Question

Answer: Option D. -> 37
16X + 85 = 17(X + 3)
X = 34 + 3 = 37

Question 3739. The average age of M boys is ‘b’ years and of ‘n’ girls ‘c’ years. The average age of all together is_________?

(mb – nc)/ (m + n) years
(mb + nc)/ (m – n) years
(mb + nc)/ (m + n) years
(mb – nc)/ (m – n) years

Discuss Question

Answer: Option C. -> (mb + nc)/ (m + n) years
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!

Question 3740. The average age of a husband and a wife is 23 years when they were married five years ago but now the average age of the husband, wife and child is 20 years(the child was born during the interval). What is the present age of the child?