document.write( "Question 1178799: Four people on one side of a river need to cross the river in a boat that can carry a maximum load of 180 pounds. The weights of the people are 80, 100, 150, and 170 pounds. What is the minimum number of crossings that must be made by the boat? \n" ); document.write( "
Algebra.Com's Answer #808211 by Edwin McCravy(20060)\"\" \"About 
You can put this solution on YOUR website!
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document.write( "The only time two can go across is when the 80 and 100 pounders\r\n" );
document.write( "go together.\r\n" );
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document.write( "Here it is with 6 crossings:\r\n" );
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document.write( " Not across    |   Across\r\n" );
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document.write( "80,100,150,170 |   none across\r\n" );
document.write( "       150,170 | 80,100             1st crossing\r\n" );
document.write( "80,    150,170 |    100             2nd crossing \r\n" );
document.write( "80,        170 |    100,150         3rd crossing\r\n" );
document.write( "80             |    100,150,170     4th crossing\r\n" );
document.write( "80,100         |        150,170     5th crossing\r\n" );
document.write( "  all across   | 80,100,150,170     6th crossing\r\n" );
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document.write( "Or it can be this way\r\n" );
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document.write( " Not across    |   Across\r\n" );
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document.write( "80,100,150,170 |   none across\r\n" );
document.write( "       150,170 | 80,100             1st crossing\r\n" );
document.write( "   100 150,170 | 80                 2nd crossing \r\n" );
document.write( "   100     170 | 80,    150         3rd crossing\r\n" );
document.write( "   100         | 80     150,170     4th crossing\r\n" );
document.write( "80,100         |        150,170     5th crossing\r\n" );
document.write( "  all across   | 80,100,150,170     6th crossing\r\n" );
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document.write( "Either way it takes 6 crossings.\r\n" );
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document.write( "Edwin

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