2. 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 63rd floor. At what floor did the elevator start? 2
2. 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 63rd floor. At what floor did the elevator start? 2
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 7P
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