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Quantitative Aptitude

AVERAGES MCQs

Averages

Total Questions : 3752 | Page 375 of 376 pages
Question 3741. A team of eight entered for a shooting competition. The best marks man scored 85 points. If he had scored 92 points, the average scores for. The team would have been 84. How many points altogether did the team score?
  1.    625
  2.    665
  3.    632
  4.    656
 Discuss Question
Answer: Option B. -> 665
8 * 84 = 672 – 7 = 665
Question 3742. The average salary of workers in an industry is Rs.200 the average salary of technicians being Rs.400 and that of non-technicians being Rs.125. What is the total number of workers?
  1.    250
  2.    275
  3.    550
  4.    400
 Discuss Question
Answer: Option C. -> 550
NO EXPLANATION IS AVAILABLE FOR THIS QUESTION!
Question 3743. The average age of 8 men increases by 2 years when two women are included in place of two men of ages 20 and 24 years. Find the average age of the women?
  1.    36 years
  2.    24 years
  3.    30 years
  4.    18 years
 Discuss Question
Answer: Option C. -> 30 years
20 + 24 + 8 * 2 = 60/2 = 30
Question 3744. The average of first five prime numbers greater than 20 is____________?
  1.    31.00
  2.    31.01
  3.    32.00
  4.    32.2
 Discuss Question
Answer: Option D. -> 32.2
23 + 29 + 31 + 37 + 41 = 161/5 = 32.2
Question 3745. The average age of three boys is 15 years and their ages are in proportion 3:5:7. What is the age in years of the youngest boy?
  1.    15
  2.    9
  3.    18
  4.    21
 Discuss Question
Answer: Option B. -> 9
3X + 5X + 7X = 45
X =3
3X = 9
Question 3746. The average of 1st 3 of 4 numbers is 16 and of the last 3 are 15. If the sum of the first and the last number is 13. What is the last numbers?
  1.    8
  2.    6
  3.    5
  4.    2
 Discuss Question
Answer: Option C. -> 5
A + B + C = 48
B + C + D = 45
A + D = 13
A – D = 3
A + D = 13
2D = 10
D = 5
Question 3747. The average of 9 observations was 9, that of the 1st of 5 being 10 and that of the last 5 being 8. What was the 5th observation?
  1.    9
  2.    8
  3.    7
  4.    6
 Discuss Question
Answer: Option A. -> 9
1 TO 9 = 9 * 9 = 81
1 TO 5 = 5 * 10 = 50
5 TO 9 = 5 * 8 = 40
5TH = 50 + 40 = 90 – 81 = 9
Question 3748. The average of first ten prime numbers which are odd is____________?
  1.    12.9
  2.    13.8
  3.    15.8
  4.    17
 Discuss Question
Answer: Option C. -> 15.8
THE ODD PRIMES :-
3 , 5 , 7 , 11 , 13 , 17 , 19 , 23 , 29 , 31
AVERAGE = 3+5+7+11+13+17+19+23+29+31/10
= 158/10
= 15.8
Question 3749. The average of 11 numbers is 10.9. If the average of first six is 10.5 and that of the last six is 11.4 the sixth number is_____________?
  1.    11.0
  2.    11.3
  3.    11.4
  4.    11.5
 Discuss Question
Answer: Option D. -> 11.5
SUM OF 11 NUMBERS = 11×10.9 = 119.9
SUM OF 1ST 6 NUMBERS = 6×10.5 = 63
SO, SUM OF LAST 5 NUMBERS = 119.9-63 = 56.9
AND SUM OF LAST 6 NUMBERS = 6×11.4 = 68.4
HENCE SIXTH NUMBER WILL BE = 68.4-56.9= 11.5
Question 3750. The average of first 10 odd numbers is_____________?
  1.    11
  2.    10
  3.    12
  4.    17
 Discuss Question
Answer: Option B. -> 10
SUM OF 10 ODD NO. = 100
AVERAGE = 100/10 = 10

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