document.write( "Question 777639: a bathtub contains 20 gallons of water and is filling at a rate of 2.4 gallons per minute but the drain is open and water drains at a rate of 3.1 gallons per minute when will you discover the bathtub is empty? \n" ); document.write( "

Algebra.Com's Answer #474213 by josmiceli(19441) $\"\"$ $\"About$

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Add the rate that the tub is filling to
\n" ); document.write( "the rate that it is emptying
\n" ); document.write( "------------------------
\n" ); document.write( "Let $\"+t+\"$ = time in minutes to empty the tub
\n" ); document.write( "I can say:
\n" ); document.write( " $\"+2.4t+-+3.1t+=+-20+\"$
\n" ); document.write( "Note that the $\"+-20+\"$ means that I end up
\n" ); document.write( "draining the tub and not filling it
\n" ); document.write( " $\"+-.7t+=+-20+\"$
\n" ); document.write( " $\"+t+=+20%2F.7+\"$
\n" ); document.write( " $\"+t+=+28.571+\"$ | min
\n" ); document.write( " $\"+.571%2A60+=+34+\"$
\n" ); document.write( "The bathtub is empty in 28 min 34 sec
\n" ); document.write( " \n" ); document.write( "

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