document.write( "Question 1189916: The Allen family and the Phillips family each used their sprinklers last summer. The water output rate for the Allen family's sprinkler was 25L per hour. The water output rate for the Phillips family's sprinkler was 30L per hour. The families used their sprinklers for a combined total of 55 hours, resulting in a total water output of 1550L. How long was each sprinkler used?
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Algebra.Com's Answer #821423 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "The Allen family and the Phillips family each used their sprinklers last summer.
\n" ); document.write( "The water output rate for the Allen family's sprinkler was 25L per hour.
\n" ); document.write( "The water output rate for the Phillips family's sprinkler was 30L per hour.
\n" ); document.write( "The families used their sprinklers for a combined total of 55 hours,
\n" ); document.write( "resulting in a total water output of 1550L. How long was each sprinkler used?
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document.write( "x = Allen's family hours\r\n" );
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document.write( "Other family hours (55-x).\r\n" );
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document.write( "Total water output equation\r\n" );
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document.write( "    25x + 30*(55-x) = 1550  liters.\r\n" );
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document.write( "From the equation\r\n" );
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document.write( "    x =  = 20.\r\n" );
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document.write( "ANSWER. A's family: 20 hours. P's family 55-20 = 35 hours.\r\n" );
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document.write( "CHECK.  20*25 + 35*30 = 1550 liters, total water output.   ! Correct !\r\n" );
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\n" ); document.write( "\n" ); document.write( "See the lesson\r
\n" ); document.write( "\n" ); document.write( " - The Robinson family and the Sanders family each used their sprinklers last summer\r
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