document.write( "Question 602717: Hello there, I have an equation that I have worked the answer out for in my head but I cannot work out how to write the formula. Please could someone help me with the formula, Thank you. The equation is : Greg bats in 7 cricket matches, in the 8th match he makes 9 runs and his average decreases by one. How many runs has he made in all? \n" ); document.write( "

Algebra.Com's Answer #380549 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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Greg bats in 7 cricket matches, in the 8th match he makes 9 runs and his average decreases by one.
\n" ); document.write( " How many runs has he made in all?
\n" ); document.write( ":
\n" ); document.write( "Let x = number of runs in all
\n" ); document.write( "then
\n" ); document.write( "(x-9) = number of runs in the first 7 matches
\n" ); document.write( ":
\n" ); document.write( "7 match average - 1 = 8 match average
\n" ); document.write( " $\"%28x-9%29%2F7\"$ - 1 = $\"x%2F8\"$
\n" ); document.write( "multiply by 56 to clear the denominators
\n" ); document.write( "8(x-9) - 56 = 7x
\n" ); document.write( "8x - 72 - 56 = 7x
\n" ); document.write( "8x - 128 = 7x
\n" ); document.write( "8x - 7x = 128
\n" ); document.write( "x = 128 runs in all \n" ); document.write( "

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