SOLUTION: Please can you answer my question. The average of five numbers is 328.8. Four of the numbers are:240,345,238 and 437. Find the fifth number.

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Question 1077422: Please can you answer my question. The average of five numbers is 328.8. Four of the numbers are:240,345,238 and 437. Find the fifth number.
Found 2 solutions by ikleyn, MathLover1:
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
.
The condition IMMEDIATELY lead you to this equation:

%28240%2B345%2B238%2B437%2Bx%29%2F5 = 328.8.


Simplify and solve it for x, which is an unknown 5-th number.


Good luck !!




Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

The average of five numbers is 328.8.
if four of the numbers are 240,345,238 and 437, fifth number is x
The average of five numbers is the sum of all numbers divided by 5.
so, we have:
%28240%2B345%2B238%2B437%2Bx%29%2F5=328.8
%281260%2Bx%29%2F5=328.8
1260%2Bx=328.8%2A5
1260%2Bx=1644
x=1644-1260
x=384->fifth number is 384