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Question

the average of 4 numbers is 8. what is the forth number if three of the numbers are 5, 7 and 9?

Source: others

Answer

(5 +7 + 9 + z)/4= 8

 

21 + z = 32

z=11 

 

 

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4 x 8 = 32
32 – 5 – 7 – 9 = 11

Ans : 11.

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8 x 4 = 5 + 7 + 9 + F

F = 32 – 21 = 11#


Alternatively, if 7 and 9 have an average of 8.

then 5 and F will also have an average of 8.

F is 11#

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