document.write( "Question 774: Sarah is 8 more than 2 times as old as Brad. In five years the sum of the ages will be 69. How old is Brad? \n" ); document.write( "

Algebra.Com's Answer #265 by arden42(16) $\"\"$ $\"About$

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First, we need to write out what we know as equations:\r
\n" ); document.write( "\n" ); document.write( " $\"s+=+8%2B2b\"$
\n" ); document.write( " $\"%28s%2B5%29+%2B+%28b%2B5%29+=+69\"$ \r
\n" ); document.write( "\n" ); document.write( "Substituting the first equation into the second gives:\r
\n" ); document.write( "\n" ); document.write( " $\"%288%2B2b%2B5%29+%2B+%28b%2B5%29=69\"$
\n" ); document.write( " $\"18%2B3b=69\"$
\n" ); document.write( " $\"3b=51\"$
\n" ); document.write( " $\"b=17\"$ \r
\n" ); document.write( "\n" ); document.write( "Brad is 17 years old. \n" ); document.write( "

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