document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=167609>Question 167609</A>: <I><SPAN STYLE=\"word-break: break-all;\"> 9. If Steven can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes, and Jack can mix 20 drinks in 15 minutes, how much time will it take all 3 of them working together to mix the 20 drinks?\r<BR>\n" );
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document.write( "A. 2 minutes and 44 seconds <BR>\n" );
document.write( "B. 2 minutes and 58 seconds <BR>\n" );
document.write( "C. 3 minutes and 10 seconds <BR>\n" );
document.write( "D. 3 minutes and 26 seconds <BR>\n" );
document.write( "E. 4 minutes and 15 seconds\r<BR>\n" );
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document.write( "10. If Sam can do a job in 4 days that Lisa can do in 6 days and Tom can do in 2 days, how long would the job take if Sam, Lisa, and Tom worked together to complete it?\r<BR>\n" );
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document.write( "A. 0.8 days <BR>\n" );
document.write( "B. 1.09 days <BR>\n" );
document.write( "C. 1.23 days <BR>\n" );
document.write( "D. 1.65 days <BR>\n" );
document.write( "E. 1.97 days\r<BR>\n" );
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document.write( "I dont know how to do this type of question. Can you PLEASE explain? </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #123510 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><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=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=123510\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> 9. If Steven can mix 20 drinks in 5 minutes, Sue can mix 20 drinks in 10 minutes, and Jack can mix 20 drinks in 15 minutes, how much time will it take all 3 of them working together to mix the 20 drinks? <BR>\n" );
document.write( "A. 2 minutes and 44 seconds <BR>\n" );
document.write( "B. 2 minutes and 58 seconds <BR>\n" );
document.write( "C. 3 minutes and 10 seconds <BR>\n" );
document.write( "D. 3 minutes and 26 seconds <BR>\n" );
document.write( "E. 4 minutes and 15 seconds <BR>\n" );
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document.write( "Find the LCD of the times, which is 30.  Figure how many drinks each would make in 30 minutes:<BR>\n" );
document.write( "Steve: 20 in 5 is 120 in 30<BR>\n" );
document.write( "Sue: 20 in 10 is 60 in 30<BR>\n" );
document.write( "Jack: 20 in 15 is 40 in 30<BR>\n" );
document.write( "Add up the drinks: 120+60+40 = 220 drinks in 30 minutes<BR>\n" );
document.write( "Now divide by 11 to see how long it takes to make 20 drinks.<BR>\n" );
document.write( "220/11 --> 30/11 minutes<BR>\n" );
document.write( "30/11 = 2.727 minutes  = 2' 44\"<BR>\n" );
document.write( "Answer A<BR>\n" );
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document.write( "10. If Sam can do a job in 4 days that Lisa can do in 6 days and Tom can do in 2 days, how long would the job take if Sam, Lisa, and Tom worked together to complete it? <BR>\n" );
document.write( "A. 0.8 days <BR>\n" );
document.write( "B. 1.09 days <BR>\n" );
document.write( "C. 1.23 days <BR>\n" );
document.write( "D. 1.65 days <BR>\n" );
document.write( "E. 1.97 days <BR>\n" );
document.write( "Instead of days per job, use jobs per day.<BR>\n" );
document.write( "For Sam, it's 1/4 per day<BR>\n" );
document.write( "for Lisa, it's 1/6<BR>\n" );
document.write( "for Tom, it's 1/2<BR>\n" );
document.write( "Add up the jobs per day they can do: 1/4 + 1/6 + 1/2<BR>\n" );
document.write( "= 3/12 + 2/12 + 6/12 = 11/12<BR>\n" );
document.write( "Together, they can do 11/12 jobs per day.  Inverting that give the days per job, 12/11 days.<BR>\n" );
document.write( "That's B, 1.09 days<BR>\n" );
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