document.write( "Question 811549: if 3 water pumps can empty a water tank in 80 minutes, it will take 4 pumps ? minutes to empty the same tank. \n" ); document.write( "
Algebra.Com's Answer #488784 by richwmiller(17219)\"\" \"About 
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3^80=
\n" ); document.write( "240 work minutes\r
\n" ); document.write( "\n" ); document.write( "240/4=60 minutes for four pumps\r
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