document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=1122630>Question 1122630</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I have won the right to build a swimming pool. The pool measures 50 metres in length, 25 metres in width and 2 metres in depth at the shallow end, sloping down (linearly) to 6 metres in depth at the other.\r<BR>\n" );
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document.write( "Using the pool measurements above, how many 50mm x 50mm tiles (margin for cement/grouting already included) will be needed, assuming an additional 10% allowance is required for wastage (to the nearest thousand)?\r<BR>\n" );
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document.write( "Options are -816,000;       -742,000;        -75,000;       -8,000<BR>\n" );
document.write( "Thanks </SPAN>\n" );
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document.write( "Since this is multiple choice, it apparently is not a real world question but rather a problem for a math assignment.  In that case, you can do the work to find the answer.<br><BR>\n" );
document.write( "There are 5 surfaces to cover:  2 sides; shallow and deep ends; and the bottom of the pool.<br><BR>\n" );
document.write( "(1) Each side is a trapezoid with bases 2 and 6 and height 25; the area of a trapezoid is the height times the average of the bases.<BR>\n" );
document.write( "(2) The shallow end is a rectangle 25x2; the deep end is a rectangle 25x6; I assume you know the formula for the area of a rectangle.<BR>\n" );
document.write( "(3) The bottom of the pool is a bit longer than 50m because of the slant.  However, since we are estimating to the nearest thousand and adding 10% for wastage, we can consider it to be a 50x25 rectangle.<br><BR>\n" );
document.write( "The square tiles are 50mm on a side, which is (1/20) meter; so it takes 20*20=400 tiles to cover a square meter.<br><BR>\n" );
document.write( "Figure the total surface area to be covered, multiply by 400 to get the number of tiles, and then add the extra 10%.<br><BR>\n" );
document.write( "One of the answer choices is correct.  You will note that 2 of the 4 answer choices are not even the right order of magnitude. </SPAN>\n" );
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