Mental Ability MCQs

Average Questions with solutions MCQs

1. Mean weight of 120 students is 55 kg. Mean weight of boys = 60, girls = 40. Find number of boys.

A

80

B

85

C

90

D

100

Average Data Entry Operator 2025
Correct Answer : D
Explanation :

Correct number of boys is 100.

Correct Answered :

Wrong Answered :

2. The average age of a class is 15.8 years. The average age of the boys is 16.4 years while that of the girls is 15.4 years. What is the ratio of boys to girls in the class?

A

1:2

B

3:4

C

3:5

D

2:3

Average Data Entry Operator 2023
Correct Answer : D
Explanation :

Using allegation rule, ratio = 0.4:0.6 = 2:3.

Correct Answered :

Wrong Answered :

3. If the average weight of 6 students is 50 kg; that of 2 students is 51 kg; and that of other 2 students is 55 kg; then the average weight of all ten students combined is:

A

54.1 kg

B

51.2 kg

C

49.3 kg

D

56.4 kg

Average Junior Assistant 2024
Correct Answer : B
Explanation :

Total=(6*50+2*51+2*55)=512, Average=512/10=51.2.

Correct Answered :

Wrong Answered :

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