Question 892512
The average of these numbers

24,57,__,39,19,46 

is 36.  

Find the missing number.
<pre>
Let the missing number be x.

Count the numbers, there are 6 of them.

{{{(24+57+x+39+19+46)/6}}}{{{""=""}}}{{{36}}}

Simplify by adding the given numbers:

{{{(185+x)/6}}}{{{""=""}}}{{{36}}}

Multiply both sides by 6

{{{185+x}}}{{{""=""}}}{{{216}}}

Subtract 185 from both sides:

{{{x}}}{{{""=""}}}{{{31}}}

The missing number is 31.

Edwin</pre>