document.write( "Question 33703This question is from textbook algebra 1
\n" ); document.write( ": It takes 10 hours to fill a pool with water, and 20 hours to drain it. If the pool is empty, and the drain is open, how long will it take to fill the pool? \n" ); document.write( "

Algebra.Com's Answer #20117 by Paul(988) $\"\"$ $\"About$

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water in - water out = 1pool
\n" ); document.write( "in: 10 hours 1/10 hours together -->x part done is hours x/10
\n" ); document.write( "out: 20 hours 1/20 hours together -->x Part done is hours x/20
\n" ); document.write( "Equation:
\n" ); document.write( " $\"x%2F10-x%2F20=1\"$
\n" ); document.write( "Multiply the whole equation by 20:
\n" ); document.write( " $\"20%28x%2F10%29-20%28x%2F20%29=20%281%2F1%29\"$
\n" ); document.write( " $\"2x-x=20\"$
\n" ); document.write( "x=20
\n" ); document.write( "Hence, it will take 20 hours to fill the pool.
\n" ); document.write( "Paul.
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