14. (6 points) Xiaoli did a Hope Cup practice paper. In the first hour, she completed $\frac{1}{5}$ of the total. In the second hour, she completed $\frac{1}{4}$ of the remaining. In the third hour, she completed $\frac{1}{3}$ of the remaining. At this point, 24 questions were left undone. Therefore, the practice paper had $\qquad$ questions in total.
【Solution】Solution: $24 \div\left(1-\frac{1}{3}\right) \div\left(1-\frac{1}{4}\right) \div\left(1-\frac{1}{5}\right)$ $=24 \div \frac{2}{3} \div \frac{3}{4} \div \frac{4}{5}$
$=60$ (problems)
Answer: This set of exercises has a total of 60 problems.
Therefore, the answer is: 60.