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**The average of seven numbers is 18. If one of the numbers is 17 and if it is replaced by 31, then the average becomes :**

A. 21.5 B. 19.5 C. 20 D. 21
**Answer: Option C**

## Show Answer

Solution(By Apex Team)

According to the question, Actual number = 17 New number = 31 Difference = 31 – 17 = 14 Difference '14' effects the seven numbers $=\Large\frac{14}{7}$=2 Present average = 18 New average = 18 + 2 = 20

## Related Questions On Average

### Ajit has a certain average for 9 innings. In the tenth innings, he scores 100 runs thereby increasing his average19 people went to a hotel for combine dinner party 13 by 8 runs. His new average is:

A. 20B. 21

C. 28

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### Find the average of all the numbers between 6 and 34 which are divisible by 5.

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### If the arithmetic mean of 0, 5, 4, 3 is a, that of -1, 0, 1, 5, 4, 3 is b and that of 5, 4, 3 is c, then the relation between a, b, and c is.

A. a = b = cB. a : b : c = 3 : 2 : 4

C. 4a = 5b = c

D. a + b + c = 12