A) \[\frac{12}{30}-\frac{6}{30}=\frac{6}{30}=\frac{1}{5}\]
B) \[\frac{12}{30}-\frac{8}{30}=\frac{4}{30}=\frac{2}{15}\]
C) \[\frac{12}{30}-\frac{4}{30}=\frac{8}{30}=\frac{4}{15}\]
D) \[\frac{3}{5}-\frac{2}{10}=\frac{1}{10}\]
E) None of these
Correct Answer: A
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