document.write( "Question 541266: Roger, Sue, and Tim have $155 among them. Roger has $5 more than Sue and Tim together. If Sue gives Time $5 he will have twice as much as she does. How much does each have? \n" ); document.write( "
Algebra.Com's Answer #354823 by jpg7n16(66)\"\" \"About 
You can put this solution on YOUR website!
Here you are solving for 3 different variables. I'd suggest solving for 1 variable and substituting back in to the problem. Let's start with turning the words into equations:
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\n" ); document.write( "\"Roger, Sue, and Tim have $155 among them.\"
\n" ); document.write( "1) \"r%2Bs%2Bt=155\"
\n" ); document.write( "\"Roger has $5 more than Sue and Tim together.\"
\n" ); document.write( "2) \"r=s%2Bt%2B5\"
\n" ); document.write( "\"If Sue gives Time $5 he will have twice as much as she does.\"
\n" ); document.write( "3) \"2%2A%28s-5%29=%28t%2B5%29\"
\n" ); document.write( "\"How much does each have?\"
\n" ); document.write( "Now it's time to solve.
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\n" ); document.write( "The way to substitute, is to say either r= or s= or t= something, and replace a variable with that \"something\" in another problem. Fortunately, equation 2 already has \"r=s%2Bt%2B5\", so that's where we'll start. Plug that back into #1 in place of R.
\n" ); document.write( "1)\"r%2Bs%2Bt=155\" becomes
\n" ); document.write( "\"%28s%2Bt%2B5%29%2Bs%2Bt=155\"
\n" ); document.write( "\"2s%2B2t=150\"
\n" ); document.write( "\"s%2Bt=75\"
\n" ); document.write( "And we can't really reduce further.
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\n" ); document.write( "Let's also make #3 easier to read.
\n" ); document.write( "3) \"2%2A%28s-5%29=t%2B5\"
\n" ); document.write( "\"2s-10=t%2B5\"
\n" ); document.write( "\"t=2s-15\"
\n" ); document.write( ".
\n" ); document.write( "Now we know what T \"equals\" so we can plug that into our simplifed #1 and solve for S.
\n" ); document.write( "1) \"s%2Bt=75\" becomes
\n" ); document.write( "\"s%2B%282s-15%29=75\"
\n" ); document.write( "\"3s-15=75\"
\n" ); document.write( "\"3s=90\"
\n" ); document.write( "\"s=30\"
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\n" ); document.write( "Now that we know what S equals, we can easily solve for R and T. Plug 30 in for S in the following equation.
\n" ); document.write( "3) \"t=2s-15\"
\n" ); document.write( "Once you figure out what T is, you can solve
\n" ); document.write( "2) \"r=s%2Bt%2B5\"
\n" ); document.write( "and you can check your answer with
\n" ); document.write( "1) \"r%2Bs%2Bt=155\"
\n" ); document.write( "Hope this helps!
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