### 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
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### 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

A. 20
B. 21
C. 28
D. 32
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A. 18
B. 20
C. 24
D. 30
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A. 10 years
B. 10.5 years
C. 11 years
D. 12 years
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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 = c
B. a : b : c = 3 : 2 : 4
C. 4a = 5b = c
D. a + b + c = 12
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