If $3^{m+n}=27$ and $3^{m-n}=\dfrac13$ then $\dfrac{m}{n}=$

If $3^{m+n}=27$ and $3^{m-n}=\dfrac13$ then $\dfrac{m}{n}=$

(A) $\dfrac15$

(B) $\dfrac14$

(C) $\dfrac12$

(D) $1$

(E) $2$

Answer: C

Source: GMAT Prep

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