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At what floor did the elevator start?

At what floor did the elevator start?

Algebra: Structure And Method, Book 1
Algebra: Structure And Method, Book 1
(REV)00th Edition
ISBN:9780395977224
Author:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Publisher:Richard G. Brown, Mary P. Dolciani, Robert H. Sorgenfrey, William L. Cole
Chapter2: Working With Real Numbers
Section2.3: Rules For Addition
Problem 1P
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One elevator of a tall building started from a certain floor, went up 7 floors, and

stopped. Then it went 20 floors down and stopped. Then it went up to the floor

twice as high as the previous floor where it stopped. Then it went down 7 floors and

finally stopped at the 63 floor. At what floor did the elevator start?

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