document.write( "Question 304764: 5 years ago,the average age of p and q was 15 years.average age of p,q and r today is 20 years. how old will r be after 10 years?
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Algebra.Com's Answer #218239 by ankor@dixie-net.com(22740) $\"\"$ $\"About$

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5 years ago,the average age of p and q was 15 years.
\n" ); document.write( " average age of p,q and r today is 20 years.
\n" ); document.write( " how old will r be after 10 years?
\n" ); document.write( ":
\n" ); document.write( "\"5 years ago,the average age of p and q was 15 years.\"
\n" ); document.write( " $\"%28%28p-5%29%2B%28q-5%29%29%2F2\"$ = 15
\n" ); document.write( " $\"%28p%2Bq-10%29%2F2\"$ = 15
\n" ); document.write( "multiply by 2
\n" ); document.write( "p + q - 10 = 30
\n" ); document.write( "p + q = 30 + 10
\n" ); document.write( "p + q = 40
\n" ); document.write( ":
\n" ); document.write( "\"average age of p,q and r today is 20 years.\"
\n" ); document.write( " $\"%28p%2Bq%2Br%29%2F3\"$ = 20
\n" ); document.write( "Multiply by 3
\n" ); document.write( "p + q + r = 60
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\n" ); document.write( "Subtract the 1st equation from the above equation
\n" ); document.write( "p + q + r = 60
\n" ); document.write( "p + q + 0 = 40
\n" ); document.write( "--------------------subtraction eliminates p & q
\n" ); document.write( "r = 20 age now
\n" ); document.write( ":
\n" ); document.write( " how old will r be after 10 years? r = 30 \n" ); document.write( "

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