Cary is trying to strip the ivy off a tree in her yard. She strips 6 feet of ivy every day, but the ivy grows another 2 feet every night. If the tree is covered by 40 feet of ivy, how many days will it take Cary to strip all the ivy off?
First find the net amount of ivy Cary removes each day by subtracting the ivy's growth from the amount she removes: 6 feet/day - 2 feet/day = <<6-2=4>>4 feet/day
Then divide the total feet of ivy by the net amount Cary removes each day to find how many days it takes her to remove all the ivy: 40 feet / 4 feet/day = <<40/4=10>>10 days
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