document.write( "Question 1139088: Benjamin & Associates, a real estate developer, recently built 198 condominiums in McCall, Idaho. The condos were either three-bedroom units or four-bedroom units. If the total number of rooms in the entire complex is 710, how many three-bedroom units are there? How many four-bedroom units are there? \n" ); document.write( "

Algebra.Com's Answer #756872 by ikleyn(52906) $\"\"$ $\"About$

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document.write( "Let x = # of three-bedroom units, y = # of four-bedroom units.\r\n" );
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document.write( "From the condition, you have these 2 equations\r\n" );
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document.write( "         x +     y = 198        (1)    (counting units)\r\n" );
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document.write( "       3*x +   4*y = 710        (2)    (counting rooms)\r\n" );
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document.write( "From equation (1), express  y = 198 - x  and substitute it into equation (2). You will get\r\n" );
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document.write( "      3x + 4*(198-x) = 710.\r\n" );
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document.write( "Express x and calculate answer\r\n" );
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document.write( "    x =  = 82.\r\n" );
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document.write( "Then from equation (1),  y = 198 - 82 = 116.\r\n" );
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document.write( "ANSWER.  82 three-bedroom units and 116 four-bedroom units.\r\n" );
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document.write( "CHECK.   3*82 + 4*116 = 710 rooms.   ! Correct !\r\n" );
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\n" ); document.write( "\n" ); document.write( "The problem solved using 2-equation setup and the Substitution method.\r
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\n" ); document.write( "\n" ); document.write( "It is a standard and typical ticket problem.\r
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\n" ); document.write( "\n" ); document.write( "For ticket problems, read the lessons\r
\n" ); document.write( "\n" ); document.write( "    - Using systems of equations to solve problems on tickets \r
\n" ); document.write( "\n" ); document.write( "    - Three methods for solving standard (typical) problems on tickets\r
\n" ); document.write( "\n" ); document.write( "in this site.\r
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\n" ); document.write( "\n" ); document.write( "From these lessons, learn on how to solve such problems once and for all.\r
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\n" ); document.write( "\n" ); document.write( "Also, you have this free of charge online textbook in ALGEBRA-I in this site\r
\n" ); document.write( "\n" ); document.write( "    - ALGEBRA-I - YOUR ONLINE TEXTBOOK.\r
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\n" ); document.write( "\n" ); document.write( "The referred lessons are the part of this online textbook under the topic \"Systems of two linear equations in two unknowns\".\r
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