document.write( "Question 265601: Sue is 25 years older than Bill. in 4 years, Sue will be twice as old as Bill will be in 4 years. How old are they now?\r
\n" ); document.write( "\n" ); document.write( "S=sue
\n" ); document.write( "b=Bill\r
\n" ); document.write( "\n" ); document.write( "s+25=b\r
\n" ); document.write( "\n" ); document.write( "I am stuck after this. I don't understand how to come up with the second equation to solve.\r
\n" ); document.write( "\n" ); document.write( "Heather \n" ); document.write( "

Algebra.Com's Answer #195264 by Edwin McCravy(20056) $\"\"$ $\"About$

You can put this solution on YOUR website!
Sue is 25 years older than Bill. in 4 years, Sue will be twice as old as Bill will be in 4 years. How old are they now?\r
\n" ); document.write( "\n" ); document.write( "S=sue
\n" ); document.write( "b=Bill
\n" ); document.write( "

\r\n" );
document.write( "s+25=b  (that's wrong!)\r\n" );
document.write( "\r\n" );
document.write( "I am stuck after this. I don't understand how to come up with the second equation to solve.\r\n" );
document.write( "\r\n" );
document.write( "Heather\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Sue is 25 years older than Bill. \r\n" );
document.write( "\r\n" );
document.write( "Sue is the oldest so you have to add 25 to Bill's age to get Sue's age.\r\n" );
document.write( "Not the other way around. So Sue's age = Bill's age + 25:\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "in 4 years, Sue will be twice as old as Bill will be in 4 years. How old are they now?\r\n" );
document.write( "\r\n" );
document.write( "In 4 years, Sue will be S+4 and Bill will be B+4, and S+4 will be twice B+4, so\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "So the system is\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "Can you solve that system. If not, post again asking how.\r\n" );
document.write( "\r\n" );
document.write( "Solution: S=46, B=21\r\n" );
document.write( "\r\n" );
document.write( "Sue is 46 and Bill is 21.\r\n" );
document.write( "\r\n" );
document.write( "Sue is 46 which is 25 years older than Bill who is 21.  In 4 years,\r\n" );
document.write( "Sue will be 50 and Bill will be 25 and she will be twice as old as \r\n" );
document.write( "Bill will be in 4 years.  So it checks.\r\n" );
document.write( "\r\n" );
document.write( "Edwin

\n" ); document.write( "

\n" );