GAUSS8 2015 Problem 7

The equal-arm scale shown is balanced. One gauss8 2015 7 has the same mass as

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Answer Choices
A. gauss8 2015 7a
B. gauss8 2015 7b
C. gauss8 2015 7c
D. gauss8 2015 7d
E. gauss8 2015 7e