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Aptitude - Averages Online Quiz
Following quiz provides Multiple Choice Questions (MCQs) related to Averages. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the quiz.
Answer : A
Explanation
Average = (3+6+9+12+15+18+21+24+27)/ 9= 135/9 = 15
Q 2 - 45 kg weight is the average of A, B and C. if the given condition of weight is 40 kg is the average of A and B while B and C have the average weight is 43 kg. Find out the weight of B?
Answer : C
Explanation
A, B and C have total weight = 45*3 = 135 kg A and B have total weight = 40*2 = 80 kg B and C have total weight = 43*2 = 86 kg ∴ weight of B = (80+86- 135) = 31 kg.
Q 3 - 38°C is the average temperature of 4 day Monday , Tuesday , Wednesday and Thursday while 40°C is the average temperature of Tuesday, Wednesday , Thursday and Friday. On Monday 30° C temperature recorded. Find out the temperature on Friday?
Answer : D
Explanation
M+T+W+Th = (38*4)= 152 ...(i) T+W+Th+F = (40*4) =160 ...(ii) After subtracting (ii)-(i) we find that f-M =8 ⇒ F-30 =8 ⇒ F =38. ∴ 38° C is the temperature on Friday.
Q 4 - 42 years is the average age of father, mother and son age. After the marriage of son, a child was born. 36 year is the average age of the family if at that time the child age is 5 year. Find out the age of the daughter in law at the marriage time?
Answer : A
Explanation
At the time of son marriage, H+W+S =(42*3)=126 and let the age of daughter in law be D years. After the marriage of the 6 year : 126+(6*3)+5+(D+6) =(36*5) ⇒ 155+D = 180 ⇒ D =(180- 155) = 25 AT the time of marriage , age of daughter in law = 25 years.
Q 5 - With the average of 12.4 takes 5 wickets by use of 26 run. A player has 0.4 downfalls in his average. What should be the number of wicket taken by him before the last match played?
Answer : A
Explanation
x is the number of wickets taken a player before the last match played. Then, (12.4x+26)/(x+5) =12 ⇒ 12.4x+26 =12x+60 ⇒ 0.4x =34 ⇒ 0.4x =34 ⇒ x= 34/0.4 ⇒ x =340/4 = 85. Wickets required = 85.
Q 6 - 7 is the average of 15 numbers. 6.5 is the average of first 8 numbers and 9.5 is the average of last 8 numbers. What should be the value of middle number?
Answer : A
Explanation
middle number = (8* 6.5) +(8*9.5)-(15*7) = (52+76- 105) = 23
Q 7 - The average age of 35 students in class is 16 years. The average age of 21 students is 14. What is the average age of remaining 14 students?
Answer - B
Explanation
Sum of the ages of 14 students = (16 x 35) - (14 x 21) = 560 - 294 = 266 Therefore Required average = 266⁄14 = 19years.
Q 8 - The mean of 50 observation was 36. It was found later that an observation 48 was wrongly taken as 23. The corrected new mean is?
Answer - A
Explanation
Correct sum = (36 x 50 + 48 - 23) = 1825. Therefore Correct Mean = 1825⁄50 = 36.5.
Q 9 - The average monthly salary of 20 employees in an organisation is Rs. 1500. If manager's salary is added, then the average salary increases by Rs. 100. What is the manager's monthly salary?
Answer - B
Explanation
Manager's monthly = (16000 x 21 - 1500 x 20) = Rs. 3600.
Q 10 - The average weight of 3 men A, B, C is 84 kg. Another man D joins the group and the average now becomes 80kg. If another man E, whose weight is 3 kg more than that of D, replaces A, then the average weight of B, C, D, E becomes 79kg. The weight of A is?
Answer - B
Explanation
Let A, B, C, D and E represent their respective weights. Then, A + B + C = (84 x 3) = 252 kg, A + B + C + D = (80 x 4) = 320 kg. D = (320 - 252)kg = 68 kg, E = (68 + 3)kg = 71 kg. B + C + D + E = (79 x 4) = 316 kg Now, (A + B + C + D) - (B + C + D + E) = (320 - 316)kg = 4 kg A - E = 4 A = ( 4 + E ) = 75 kg.