\(\frac{x}{27}=\frac{12}{18}\)
Vì \(\frac{x}{27}=\frac{12}{18}\Rightarrow x\cdot18=27\cdot12\)
\(\Rightarrow x=\frac{27\cdot12}{18}=18\)
\(\frac{35}{49}=\frac{10}{x}\)
Vì \(\frac{35}{49}=\frac{10}{x}\Rightarrow35\cdot x=49\cdot10\)
\(\Rightarrow x=\frac{49\cdot10}{35}=14\)