document.write( "Question 460040: A vacuum pump removes 1/7 of the air from a jar on each stroke of its piston. What percent of the air remains after four strokes of the piston? \n" ); document.write( "
Algebra.Com's Answer #315516 by jorel1380(3719)\"\" \"About 
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1/7x4=4/7 percent of air removed
\n" ); document.write( "7/7-4/7=3/7 percent air remaining..
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