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Mark’s age twenty years ago if she will be N years old at 10 years from now? a. 20 - N b. 30 - N c. N - 20 d. N - 30

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

Chapter9: Systems Of Linear Equations

Section9.7: Puzzle Problems

Problem 18OE

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Question

What is Mark’s age twenty years ago if she will be N years old at 10 years from now?

a. 20 - N

b. 30 - N

c. N - 20

d. N - 30

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