Answer
Each of the statements have no units.
This makes them ambiguous.
Work Step by Step
The statement "My dog weighs 15 kg" is unambiguous as it uses the correct SI unit for mass.
Chemistry: An Introduction to General, Organic, and Biological Chemistry (12th Edition)
by Timberlake, Karen C.
Published by
Prentice Hall
ISBN 10:
0321908449
ISBN 13:
978-0-32190-844-5
Chapter 2 - Section 2.1 - Units of Measurement - Questions and Problems - Page 27: 2.2b
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