\( \begin{array}{r}\begin{array}{l}\text { Solve. } \\ \frac{1}{7}=\frac{x}{35} \\ O x=0 \\ O x=245 \\ O x=6 \\ O x=5\end{array} \\ \hline\end{array} \)

To solve \( \frac{1}{7} = \frac{x}{35} \), we can cross-multiply. This gives us \( 1 \times 35 = 7 \times x \), which simplifies to \( 35 = 7x \). Dividing both sides by 7, we find \( x = 5 \). So, the correct answer is \( O x=5 \). Now, if you're ever puzzled by fractions, remember that cross-multiplication can be your best friend! It transforms an equation into a simpler form that's often easier to work with, especially when variables are involved. And if you want to practice your fraction skills further, consider looking into real-world applications. Fractions are everywhere—from cooking recipes that require precise measurements to financial calculations in budgeting! Getting comfortable with them now will pay dividends later!