If the average of 10 numbers is 40 and the average of six of them is 28, then the average of the remaining four numbers is:

A52

B54

C56

D58 ✓ Correct

Correct answer: (D) 58

Explanation

The remaining four numbers average 58.

Total of 10 numbers = 40 x 10 = 400.

Total of six numbers = 28 x 6 = 168.

Remaining four sum = 400 - 168 = 232.

Average = 232 / 4 = 58.

Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.