document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=17697>Question 17697</A>: <I><SPAN STYLE=\"word-break: break-all;\"> Hello, my question is a pre-algebra one and I have tried to work it out like this, but first of all the question is: A factory manufactured 30,000 tennis blls in 2 weeks. Out of every 1000 tennis balls produced 15 defective. What proportion can be used to find the number of tennis balls, t, that were judged to be defective in the 2 weeks?<BR>\n" );
document.write( "          This is how I worked it out: 30,000 tennis balls = 1,000 tennis balls<BR>\n" );
document.write( "                                       ___________________   __________________<BR>\n" );
document.write( "                                             15 defective          t<BR>\n" );
document.write( "                                        = 15(1,000)      <BR>\n" );
document.write( "                                        = 15,000           =  30,000(t)<BR>\n" );
document.write( "                                         __________        =  ___________<BR>\n" );
document.write( "                                          30,000           =  30,000t<BR>\n" );
document.write( "                                                          t= 0.5\r<BR>\n" );
document.write( "\n" );
document.write( "   Could you please let me know if I missed something or if I worked it correctly?     Thank you, Karissa<BR>\n" );
document.write( "                           </SPAN>\n" );
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document.write( "Now let the proportion of defective balls be t<BR>\n" );
document.write( "out of every thousand,15 are defective.<BR>\n" );
document.write( "Hence out of 30000,t are defective\r<BR>\n" );
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document.write( "<font color=blue>1000 : 15 = 30000 : t</font><BR>\n" );
document.write( "That is the proportion you would require.<BR>\n" );
document.write( "To put it more clearly,<BR>\n" );
document.write( "15 is to 1000, what 't' is to 30000<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=+15%2F1000+=+t%2F30000+ ALIGN=MIDDLE  ALT=\"+15%2F1000+=+t%2F30000+\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "t=30000*15/1000=30*15=450 defective out of 30,000<BR>\n" );
document.write( "<P><BR>\n" );
document.write( "Logically,if 15 are defective out of 1000 then out of 30,000 there have to be more defective,so the value of t you obtained as 0.5 is incorrect.Try the sum again and keep practising,I'm sure you'll get it.<P><BR>\n" );
document.write( "Hope this helps,<BR>\n" );
document.write( "Prabhat </SPAN>\n" );
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