SOLUTION: 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?

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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?
Answer by jorel1380(3719) About Me  (Show Source):
You can put this solution on YOUR website!
1/7x4=4/7 percent of air removed
7/7-4/7=3/7 percent air remaining..