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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.
Q 1 - Find out the average of A and B if the given value of 16A+ 16B = 48
Answer : A
Explanation
16a+16b = 48 ⇒ 16(a+b) = 48 ⇒ (a+b) = 3 So, we have a and b average is (a+b)/2 = 3/2 = 1.5
Q 2 - 37 °C is mean temperature of 3 days Monday, Tuesday, Wednesday while 34°C is average of Tuesday, Wednesday and Thursday . What should be the temperature on Thursday if the temperature was 4/5 of that of Monday?
Answer : B
Explanation
M+ T+W =(37*3) = 111...(i) T+W+Th= (34*3) = 102 ...(ii) Th =4/5m ⇒ M = 5/4*th ...(iii) (ii)-(i) gives , M-Th = 9 ⇒ 5 Th /4 Th =9 If we assume that x° is the temperature on Thursday. Then, 5x/4 x =9 ⇒ 5x-4x = 36 ⇒ x = 36° Hence, its proves that the Thursday temperature was 36°.
Q 3 - 50 marks is the average of 5 students in English. What should be the right average if 48 marks read 84 by mistake.
Answer : A
Explanation
Sum of the 5 students mark = (50*5)= 250 We find the actual sum of 5 students mark = (250+48- 84) = 214 Hence, the right average will be = 214/5 = 42.8
Q 4 - Before the period of 10 years, 24years is the average of 4 members family. After two children born, the average age of the family no change if 2 years is the age difference between 2 children then what should be the youngest child age?
Answer : A
Explanation
x is the age of the youngest child. Then, elder son child age = (x+2) years. At the present day average age of 6 members = 24 years. At the present day , some of the ages of 6 members = (24*6)= 144 years. (24*4)+(10*4) +x+(x+2) =144 ⇒ 2x = 6 ⇒ x= 3 At the present time the youngest child have 3 year age old.
Q 5 - What should be the weight of the new men if a 56 kg person replaced by new person then 2.5 kg weight increase in the average of 8 person weight?
Answer : D
Explanation
total weight increment = (2.5* 8)= 20 kg. New men weight = (56+20) = 76 kg
Q 6 - Find out the value of x1 if 16 is the average of x1,x2,x3 and x4. Here 23 is the half sum of x2, x3 and x4.
Answer : C
Explanation
(x1+x2+x3+x4 /4) =16 ⇒ (x1+x2+x3+x4)= 64 1/2 (x2+x3+x4) =23 ⇒ (x2+x3+x4)= 46 Value of x1 = (64-46) =18
Q 7 - The average of six numbers is 3.95. The average of two of them is 3.4, while the average of the other two is 3.85. What is the average of the remaining two numbers?
Answer - B
Explanation
Sum of the remaining two numbers = (3.95 x 6) - [(3.4 x 2) + (3.85 x 2)] = 23.70 - (6.8 + 7.7) = 23.70 - 14.5 = 9.20 Therefore Required average = 9.2⁄2 = 4.6.
Q 8 - Average of ten positive numbers is ‾z. if each number is increased by 10%, then ‾z?
Answer - B
Explanation
‾z is increased by 10%.
Q 9 - The captain of a cricket team of 11 members is 26 years old and the wicket keeper is 3 years older. If the ages of these two are excluded the average age of the remaining players is one year less than the average age of the whole team. What is the average age of the team?
Answer - B
Explanation
Let the average age of the whole team be z years. Therefore 11z - (26 + 29) = 9 (z - 1) = 11z - 9z = 46 = 2z = 46 = z = 23 So, average age of team is 23 years.
Q 10 - 10 years ago. the average age of a family of 4 members was 24 years. Two children having been born, (with age difference) the present average age of the family is the same today. The present age of the youngest child is?
Answer - B
Explanation
Total age of 4 members, 10 years ago = (24 x 4) years = 96 years Total age of 4 members now = 96 + 10 x 4 yrs = 136 years Total age of 6 members now = (24 x 6) years = 144 years Sum of the ages of 2 children = (144 - 136) years = 8 years Let the age of the younger child be z years. Then, age of the elder child = (z + 2) years so, z + z + 2 = 8 2z = 6 z = 3 Therefore Age of younger child = 3 years.