The average of five numbers is x. If the average of the first four numbers is m, what is the value of the fifth number?

A    4m-5x

B    5x-4m

C    5x-m

D    5x-3m

Solution

Correct Answer: Option B

 

suppose, average of 5 number is x average of  4 number is m so 5th number is = 5x-4m  

 

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