Easy but Analytical

The average of 5, 10, 15 and z is 20. What is z?

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RE: Easy but Analytical

Ans:  z = 50

 

Solution: 

Since,   5 + 10 + 15 + z = 30 + z

 

That is, equivalent to the four distinct numbers in which the average turns out to be 20. 

 

So, (30 + z)/4 = 20

30 + z = 80

 

then, z = 50.

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