the average of 5 consecutive numbers is n if next two number..., Average, General Mathematics

Question:The average of `5` consecutive numbers is n.If next two number are also included, the average will

A increase by `1` 
B remain the same 
C increase by `1.4` 
D increase by `2`

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+ AnswerA

+ ExplanationLet five consecutive numbers be x,x + 1,x + 2,x + 3, & x + 4.

Their average 

`= (5x + 10)/5`

`= (x + 2)`.

Average of `7` numbers 

`= (5x + 10) + (x + 5) + (x + 6)/7`

`= (x + 3)`.

So, the average increased by `1`.

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