document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=572741>Question 572741</A>: <I><SPAN STYLE=\"word-break: break-all;\"> An athlete can burn 10 calories per minute while running and 4 calories per minute while walking.  If the athlete burns 450 calories in 60 minutes, how long is spent on each activity? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #368491 by </B><A HREF=/tutors/aboutme.mpl?userid=mathsmiles><B>mathsmiles(68)</B></A><img src=\"/images/stars/stars-08.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=mathsmiles><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=mathsmiles><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=368491\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> This athlete trains for 60 minutes.  Some of those minutes are spent walking and some are spent running.\r<BR>\n" );
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document.write( "X minutes he spends running.  The rest of the hour (60-X) minutes he spends walking.\r<BR>\n" );
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document.write( "If he burns 10 cals per minute running then his total calories running are <BR>\n" );
document.write( "10 cals/min times X minutes.  <BR>\n" );
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document.write( "If he burns 4 cals per minute walking then his total calories walking are 4 cals/min times (60-X) minutes.\r<BR>\n" );
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document.write( "All together he burns 450 calories.\r<BR>\n" );
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document.write( "Put these 3 statements together and we have <BR>\n" );
document.write( "10X + 4(60-X) = 450<BR>\n" );
document.write( "10X + 240 - 4X = 450.  Subtract 240 from each side of the equation ... <BR>\n" );
document.write( "10X - 4X = 210.  Combining like X terms ... <BR>\n" );
document.write( "6X = 210.  Dividing both sides by 6 ... <BR>\n" );
document.write( "X = 35 minutes\r<BR>\n" );
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document.write( "He spends 35 minutes running and 60-35 = 25 minutes walking.\r<BR>\n" );
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document.write( "Let's check our answer:<BR>\n" );
document.write( "10 cals/min times 35 minutes = 350 calories.<BR>\n" );
document.write( "4 cals/min times 25 minutes = 100 calories.<BR>\n" );
document.write( "Adding them gives us 450 calories.  Check!\r<BR>\n" );
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document.write( " </SPAN>\n" );
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