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Quantitative Aptitude

BASIC MATHS MCQs

Total Questions : 233 | Page 23 of 24 pages
Question 221. 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 222. 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 223. 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 224. 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 225. 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 226. 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
Question 227. The average of first 10 natural numbers is____________?
  1.    5
  2.    5.5
  3.    6.5
  4.    6
 Discuss Question
Answer: Option B. -> 5.5
SUM OF 10 NATURAL NO. = 110/2 = 55
AVERAGE = 55/10 = 5.5
Question 228. 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
HI FRIEND !!!
HERE IS YOUR ANSWER !!!
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 229. 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 230. 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

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