Câu trả lời:

\(\frac{18,7}{x}=3,11\left(6\right)\)

\(\Rightarrow\frac{18,7}{x}=\frac{187}{60}\)

\(\Rightarrow x=\frac{18,7\cdot60}{187}=\frac{187\cdot6}{187}=6\)