document.write( "Question 936560: Robert is 15 years old than his sister Stan. However \"y\" years old ago, Robert was twice as old as Stan. If Stan is now \"b\" years old and b > y, Find the value of ( b - y )
\n" ); document.write( " \n" ); document.write( "
Algebra.Com's Answer #570008 by ankor@dixie-net.com(22740)\"\" \"About 
You can put this solution on YOUR website!
Robert is 15 years older than his sister Stan. (imagine someone naming a girl \"Stan\")
\n" ); document.write( "r = s + 15
\n" ); document.write( ":
\n" ); document.write( " However \"y\" years old ago, Robert was twice as old as Stan.
\n" ); document.write( "r - y = 2(s - y)
\n" ); document.write( " If Stan is now \"b\" years old and b > y,
\n" ); document.write( "s = b, then r = (b+15)
\n" ); document.write( "In the 2nd equation, replace r with (b+15) and s with b
\n" ); document.write( "(b+15) - y = 2(b - y)
\n" ); document.write( "b + 15 - y = 2b - 2y
\n" ); document.write( "15 = 2b - b - 2y + y
\n" ); document.write( "15 = b - y
\n" ); document.write( "Find the value of (b - y) = 15
\n" ); document.write( ":\r
\n" ); document.write( "\n" ); document.write( " \n" ); document.write( "
\n" );