Let x be the total number of questions on the test; then,
[tex]\begin{gathered} 14\to70\% \\ x\to100\% \end{gathered}[/tex]Which is equivalent to
[tex]\Rightarrow\frac{14}{70}=\frac{x}{100}[/tex]Solve for x as shown below
[tex]\begin{gathered} \Rightarrow x=\frac{14\cdot100}{70}=20 \\ \Rightarrow x=20 \end{gathered}[/tex]The answer is 20 questions in total on the test