document.write( "Question 391276: Working alone two metal crushers can each process one truckload of aluminum cans in 25 min. After the two machines have been working for 6 min they are joined by a third machine that by itself could process one truckload in 20 min. How long after the first two machines start working will one truckload of cans be processed? \n" ); document.write( "
Algebra.Com's Answer #277596 by scott8148(6628)\"\" \"About 
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each machine does a FRACTION of the job , based on the individual times ___ the fractions add to one (the WHOLE job)\r
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\n" ); document.write( "\n" ); document.write( "(x / 25) + (x / 25) + [(x - 6) / 20] = 1\r
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\n" ); document.write( "\n" ); document.write( "multiplying by 100 (LCD) ___ 4x + 4x + 5x - 30 = 100
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