document.write( "Question 86917: in 2007 there are 350 libraries in southern illinois. this is a 75% increase over 2000. how many were there in 2000? \n" ); document.write( "
Algebra.Com's Answer #62858 by Flake(45)\"\" \"About 
You can put this solution on YOUR website!
Let L be number of libraries in 2000\r
\n" ); document.write( "\n" ); document.write( "---Solution#1:
\n" ); document.write( "(Number libraries in 2007) = (number of livraries in 2000)+ (75% increase)
\n" ); document.write( "350 = L + 0.75L
\n" ); document.write( "Now solve for L\r
\n" ); document.write( "\n" ); document.write( "---Solution#2:
\n" ); document.write( "Another way to thinking is you have system that's change from one condition (state) to another.
\n" ); document.write( "The change from State#1 to State#2 is +75% compared State#1.
\n" ); document.write( "For example:
\n" ); document.write( "L1=number of libraries in 2005
\n" ); document.write( "L2=number of libraries in 2007 = 350
\n" ); document.write( "\"%28L2+-+L1%29%2FL1+=+0.75+\"
\n" ); document.write( "\"%28350+-+L1%29%2FL1+=+0.75+\" \r
\n" ); document.write( "\n" ); document.write( "If you rewrite it's the same equation as the Solution#1.
\n" ); document.write( "But thinking this way can help with other future subjects like chem or physics, when they start talking about systems changing.
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