An elevator started at the first floor and went up 18 floors. It then came down 11 floors
and went back up 16. At what floor was it stopped?

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(18-11)+16
= 7+16
= 23rd floor
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What is the difference between earthworm and red worm.
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18 + 1 = 19 - 11 = 8 + 16 =24
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