document.write( "Question 954196: The Howard family and the Gray family each used their sprinklers last summer. The water output rate for the Howard family's sprinkler was
\n" ); document.write( "40L per hour. The water output rate for the Gray family's sprinkler was
\n" ); document.write( "25L per hour. The families used their sprinklers for a combined total of
\n" ); document.write( "45 hours, resulting in a total water output of
\n" ); document.write( "1500L. How long was each sprinkler used?
\n" ); document.write( "Howards family sprinklers:___
\n" ); document.write( "Grays family sprinkler:___ \n" ); document.write( "
Algebra.Com's Answer #582750 by lwsshak3(11628)\"\" \"About 
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The Howard family and the Gray family each used their sprinklers last summer. The water output rate for the Howard family's sprinkler was
\n" ); document.write( "40L per hour. The water output rate for the Gray family's sprinkler was
\n" ); document.write( "25L per hour. The families used their sprinklers for a combined total of
\n" ); document.write( "45 hours, resulting in a total water output of
\n" ); document.write( "1500L. How long was each sprinkler used?
\n" ); document.write( "Howards family sprinklers: 25 hrs
\n" ); document.write( "Grays family sprinkler: 20 hrs
\n" ); document.write( "***
\n" ); document.write( "let x=time Howards family sprinklers were used
\n" ); document.write( "45-x=time Grays family sprinkler were use
\n" ); document.write( "..
\n" ); document.write( "rate*time used=output
\n" ); document.write( "40x+25(45-x)=1500
\n" ); document.write( "40x+1125-25x=1500
\n" ); document.write( "15x=375
\n" ); document.write( "x=25
\n" ); document.write( "45-x=20 \n" ); document.write( "
\n" );