document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=76952>Question 76952</A>: <I><SPAN STYLE=\"word-break: break-all;\"> \r<BR>\n" );
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document.write( "A rainwater collection tank is nearly full at a level of 120 in. The water will be used at a rate that lowers the level 6 in. per day. Which equation can be used to determine the time it will take (in days) to lower the level to 3 in.?\r<BR>\n" );
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document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #55223 by </B><A HREF=/tutors/aboutme.mpl?userid=bucky><B>bucky(2189)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=bucky><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/images/nopicture.jpg><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=55223\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> From the problem you know that the water level needs to drop from 120 inches deep to 3 inches<BR>\n" );
document.write( "deep.  Therefore, the total amount of this drop is 120 - 3 inches.<BR>\n" );
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document.write( "Each day the water drops 6 inches. So if you multiply 6 times the number of days (D) you will<BR>\n" );
document.write( "get the total drop. Set these two total drops equal.  In equation form it becomes:<BR>\n" );
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document.write( "6*D = 120 - 3<BR>\n" );
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document.write( "Subtract the two numbers on the right side.  When you do, you get that the amount of drop<BR>\n" );
document.write( "in the tank is 117 inches. Substitute this amount into the equation, and the equation <BR>\n" );
document.write( "becomes:<BR>\n" );
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document.write( "6*D = 117 inches<BR>\n" );
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document.write( "But we want to solve for D, the number of days that it takes for the level in the tank<BR>\n" );
document.write( "to be down to 3 inches.  Do this by dividing both sides of the equation by 6, the multiplier<BR>\n" );
document.write( "of D.  When you do, the equation is reduced to:<BR>\n" );
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document.write( "D = 117/6 = 19 + 3/6 = 19 + 1/2 = 19.5 days<BR>\n" );
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document.write( "In 19 and a half days the water will drop from 120 inches deep to 3 inches deep if the<BR>\n" );
document.write( "water level drops 6 inches a day.<BR>\n" );
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document.write( "Hope this helps you to understand the problem and how to set up and solve the equation.\r<BR>\n" );
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