SOLUTION: how to get the answer when you have the average but you are missing a number in the number line aka a fill in the blank

Algebra ->  Average -> SOLUTION: how to get the answer when you have the average but you are missing a number in the number line aka a fill in the blank      Log On


   



Question 826003: how to get the answer when you have the average but you are missing a number in the number line aka a fill in the blank
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
I think this is what you're asking:
+%28+3+%2B+7+%2B+4+%2B+x+%2B+2+%2B+11+%29+%2F+6+=+5+
where +5+ is the average of the given
numbers including the missing number
------------------------------------
There are 6 numbers, so you add them
and divide by 6 to get the average
Multiply both sides by +6+
+3+%2B+7+%2B+4+%2B+x+%2B+2+%2B+11+=+6%2A5+
+27+%2B+x+=+30+
+x+=+3+
------------
check:
+%28+3+%2B+7+%2B+4+%2B+3+%2B+2+%2B+11+%29+%2F+6+=+5+
+30%2F6+=+5+
+5+=+5+
OK