document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=574575>Question 574575</A>: <I><SPAN STYLE=\"word-break: break-all;\"> how do I work out Wally's stride length is 80cm how many strides will he take to cover 16km..I shudder at these, please help </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #369161 by </B><A HREF=/tutors/aboutme.mpl?userid=josmiceli><B>josmiceli(19441)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=josmiceli><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=josmiceli><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=369161\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> The way to approach these is to think in terms<BR>\n" );
document.write( "of the units only. Work it out as units, and then<BR>\n" );
document.write( "plug in the numbers.<BR>\n" );
document.write( "Working step-by-step:<BR>\n" );
document.write( "( strides / cm ) x ( cm/m )<BR>\n" );
document.write( "Rewrite this as:<BR>\n" );
document.write( "( cm/cm ) x ( strides/m )<BR>\n" );
document.write( "Now you want:<BR>\n" );
document.write( "( cm/cm ) x ( strides/m ) x ( m/km )<BR>\n" );
document.write( "Now rewrite this as:<BR>\n" );
document.write( "( cm/cm ) x ( m/m ) x ( strides/ km )<BR>\n" );
document.write( "This is the right approach as far as units go<BR>\n" );
document.write( "Everything cancels except ( strides / km )<BR>\n" );
document.write( "----------------------------------<BR>\n" );
document.write( "Now work backwards toward actual unit conversions:<BR>\n" );
document.write( "( strides/cm ) x ( cm/m ) x ( m/km ) = ( strides/km )<BR>\n" );
document.write( "This is exactly the same as:<BR>\n" );
document.write( "( cm/cm ) x ( m/m ) x ( strides/ km )<BR>\n" );
document.write( "with multipliers and divisors just shifted around<BR>\n" );
document.write( "Now, and only now, plug in numbers.<BR>\n" );
document.write( "multiply by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+16+ ALIGN=MIDDLE  ALT=\"+16+\"   DISABLED_style= \"max-width:90%; height:auto;\" > km, and you end up with<BR>\n" );
document.write( "a single unit: ( strides ), which is what you want<BR>\n" );
document.write( "( strides/cm ) x ( cm/m ) x ( m/km ) x ( km ) = ( strides )<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+%28+1%2F80+%29%2A%28+100%2F1+%29%2A%28+1000%2F1+%29%2A%28+16+%29++=+20000+ ALIGN=MIDDLE  ALT=\"+%28+1%2F80+%29%2A%28+100%2F1+%29%2A%28+1000%2F1+%29%2A%28+16+%29++=+20000+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Wally needs 20,000 strides to cover 16 km<BR>\n" );
document.write( "----------------<BR>\n" );
document.write( "I never, but never, jump right into the numbers. I learned the<BR>\n" );
document.write( "units method in high school physics where the teacher would<BR>\n" );
document.write( "fill a blackboard with just unit conversions.    </SPAN>\n" );
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