document.write( "Question 117943: heere's the tricky question:An open rectangular tub of uniform thickness 10cm has external dimensions 165cm*100cm*75cm. What volume is required to completely fill the tank? \n" ); document.write( "
Algebra.Com's Answer #85963 by Edwin McCravy(20055)\"\" \"About 
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document.write( "here's the tricky question:An open rectangular tub of uniform thickness 10cm\r\n" );
document.write( "has external dimensions 165cm*100cm*75cm. What volume is required to completely\r\n" );
document.write( "fill the tank?\r\n" );
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document.write( "Let's get the internal dimensions from the external dimensions and the\r\n" );
document.write( "thickness of the walls and bottom:\r\n" );
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document.write( "1. To get the internal length, we must subtract the thickness TWICE from the\r\n" );
document.write( "external length of the tub, once for the thickness on the left side and once\r\n" );
document.write( "for the thickness on the right side. So the internal length of the tub is\r\n" );
document.write( "165cm - 2×10cm = 165cm - 20cm = 145cm.\r\n" );
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document.write( "2. To get the internal width, we must subtract the thickness TWICE from the\r\n" );
document.write( "external length of the tub, once for the thickness on the front side and once\r\n" );
document.write( "for the thickness on the back side. So the internal width of the tub is\r\n" );
document.write( "100cm - 2×10cm = 100cm - 20cm = 80cm.\r\n" );
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document.write( "3. To get the internal height, we must subtract the thickness ONLY ONCE from\r\n" );
document.write( "the external height of the tub for the thickness on the bottom side. We are\r\n" );
document.write( "told there is no top on the tub.  So the internal length of the tub is\r\n" );
document.write( "75cm - 10cm = 65cm.\r\n" );
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document.write( "So volume of interior of tub = length×width×height = 145cm×80cm×65cm =\r\n" );
document.write( "754000 cm³.\r\n" );
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document.write( "Edwin
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