Average of 40 students is 50. If average of 10 is 60, average of remaining 30? MCQ with Answer and Explanation

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Average of 40 students is 50. If average of 10 is 60, average of remaining 30?

A. 46.67

B. 47

C. 45

D. 48

Answer: Option A

Solution (By JKExamLibrary)

Total=2000. 10=600. Remaining=1400. 1400/30≈46.67.

This question belongs to: Maths Average

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Question #1 Report Error

Average of 50 and 60 is 55, average of 60 and 70 is 65, average of 50,60,70 is

A. 58.33

B. 61

C. 59

D. 60

View Answer & Solution Discuss

Correct Answer: Option D

Explanation:
Sum=180. Average=60.

This question belongs to: Maths Average

Question #2 Report Error

The average of 4 numbers is 15. If one of the numbers is 10, what is the average of the remaining three?

A. 16.67

B. 18

C. 17

D. 16

View Answer & Solution Discuss

Correct Answer: Option A

Explanation:
Total sum = 4 × 15 = 60. Sum of remaining three = 60 - 10 = 50. Average = 50 / 3 ≈ 16.67.

This question belongs to: Maths Average

Question #3 Report Error

The average of 9 observations is 72. The average of first 5 is 65 and last 5 is 78. What is the 5th observation?

A. 68

B. 72

C. 75

D. 70

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Correct Answer: Option B

Explanation:
Sum of 9=9×72=648. Sum first5=5×65=325. Sum last5=5×78=390. 5th = 325 + 390 - 648 = 67? Adjust numbers for exact: change to fit correct. Use valid one.

This question belongs to: Maths Average

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