Answer:
I have a great love for books. I always try to save money to buy books. I understand the value of books, for me, the investment I put in books is worth it. Now I have enough savings to buy the books I like. In the future, I hope to be able to use my precious books as a tool to help young people in particular and society in general. Therefore, I intend to use that "book" investment to build a library for poor children who want to read books, they can read books for free. Although I won't bring in a large sum of money, it makes me happy.
![\dfrac{15}{4} \times \dfrac{13}{4} \times \dfrac{12}{4} = \dfrac{15 \times 13 \times 12}{4 \times 4 \times 4}](https://tex.z-dn.net/?f=%5Cdfrac%7B15%7D%7B4%7D%20%5Ctimes%20%5Cdfrac%7B13%7D%7B4%7D%20%5Ctimes%20%5Cdfrac%7B12%7D%7B4%7D%20%3D%20%5Cdfrac%7B15%20%5Ctimes%2013%20%5Ctimes%2012%7D%7B4%20%5Ctimes%204%20%5Ctimes%204%7D)
You will need to reduce the answer you get from that, since there are numbers that divide into both the numerator and denominator.
Can you take it from there?