document.write( "Question 696861: 10 years ago, Al was half as old as Bill is now, and 7 years from now, Al will be as old as Bill is now. Set up a system of equations that can be used to determine the ages now of Al and Bill, then solve the system \n" ); document.write( "
Algebra.Com's Answer #429418 by henew(13)\"\" \"About 
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Al's current age A
\n" ); document.write( "Bill's current age B.\r
\n" ); document.write( "\n" ); document.write( "\"10 years ago, Al was half as old as Bill is now\" A-10= B/2
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\n" ); document.write( "\"7 years from now, Al will be as old as Bill is now\" A+7=B\r
\n" ); document.write( "\n" ); document.write( "B/2=A-10 can be written as B= 2A-20 ( multiply by 2 on both sides) . From second equation B= A+7\r
\n" ); document.write( "\n" ); document.write( "2A-20= A+7\r
\n" ); document.write( "\n" ); document.write( "2A-A=20+7 \r
\n" ); document.write( "\n" ); document.write( " SO\r
\n" ); document.write( "\n" ); document.write( " A=27\r
\n" ); document.write( "\n" ); document.write( " B= 27+7=34\r
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