Is there a multiple choice ?
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The answer is
A= 1800
B=3600
C=7200
We get this answer by solving the system of equations of
B= 2•A
C= 2• B
12600= A+B+C
The answers are
A. The Shang was the first family of rulers in China.
B. Shang emperors had great walled <span>cities built.
</span><span>C. Shang emperors were powerful rulers.
</span><span>F. Workers cast and decorated bronze goblets, cups, and bowls.</span>