document.write( "Question 53800: It's been a while! I have 2 known numbers and an average of 3 numbers. The numbers I know are 72 and 73 and the average including the 3rd number is 72.9. Here is my formula and I'm trying to solve for x:
\n" ); document.write( "(72+73+x)/3=72.9. \n" ); document.write( "

Algebra.Com's Answer #36045 by funmath(2933) $\"\"$ $\"About$

You can put this solution on YOUR website!
First simplify the parenthese, then multiply both sides by 3, then subtract 145 from both sides like so:
\n" ); document.write( " $\"%2872%2B73%2Bx%29%2F3=72.9\"$
\n" ); document.write( " $\"%28145%2Bx%29%2F3=72.9\"$
\n" ); document.write( " $\"3%28145%2Bx%29%2F3=3%2872.9%29\"$
\n" ); document.write( " $\"%28cross%283%29%29%28145%2Bx%29%2F%28cross%283%29%29=218.7\"$
\n" ); document.write( " $\"145%2Bx=218.7\"$
\n" ); document.write( " $\"-145%2B145%2Bx=218.7-145\"$
\n" ); document.write( " $\"x=73.7\"$
\n" ); document.write( "Happy Calculating! \n" ); document.write( "

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