document.write( "Question 357158: At Johnson Middle school, 170 students buy 3 ring binders from school store. This number has been increasing at a rate of about 25 per year. The number of students buying 2 ring binders is 300 and has been decreasing at a rate of about 15 per year. At these rates, when will the number of 2 ring binders sold be half the number of 3 ring binders sold? \n" ); document.write( "
Algebra.Com's Answer #255056 by stanbon(75887)\"\" \"About 
You can put this solution on YOUR website!
At Johnson Middle school, 170 students buy 3 ring binders from school store. This number has been increasing at a rate of about 25 per year.
\n" ); document.write( "---
\n" ); document.write( "#(3 ring) = 170+25x
\n" ); document.write( "------------------------------------
\n" ); document.write( "The number of students buying 2 ring binders is 300 and has been decreasing at a rate of about 15 per year.
\n" ); document.write( "---
\n" ); document.write( "#(2 ring) = 300-15x
\n" ); document.write( "==============================
\n" ); document.write( " At these rates, when will the number of 2 ring binders sold be half the number of 3 ring binders sold?
\n" ); document.write( "---
\n" ); document.write( "Equation:
\n" ); document.write( "Solve: 300-15x = (1/2)(170+25x)
\n" ); document.write( "---
\n" ); document.write( "600 - 30x = 170+25x
\n" ); document.write( "55x = 430
\n" ); document.write( "x = 7.82 years
\n" ); document.write( "--------------------------
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
\n" ); document.write( " \n" ); document.write( "
\n" );