document.write( "Question 526363: How do you do this?? The average of the first 3 numbers was 9. The average of the next 7 numbers was 30. What was the overall average of the 10 numbers? \n" ); document.write( "

Algebra.Com's Answer #348497 by Earlsdon(6294) $\"\"$ $\"About$

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The way you would do this problem is:
\n" ); document.write( "Find the sum of the first three numbers (x) then find the sum of the next 7 numbers (y), add these two sums together (x+y) and divide the lot by the total number of numbers, which is 10, ( $\"%28x%2By%29%2F10\"$ ).
\n" ); document.write( " $\"x%2F3+=+9\"$ Multiply both sides by 3.
\n" ); document.write( " $\"x+=+27\"$
\n" ); document.write( " $\"y%2F7+=+30\"$ Multiply both sides by 7.
\n" ); document.write( " $\"y+=+210\"$ .
\n" ); document.write( " $\"%28x%2By%29%2F10+=+237%2F10\"$ = $\"23.7\"$ \r
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