Step 1:
The question involved direct proportion, meaning, if one quantity increases, the other increases, and when one decreases, the other also decreases.
Step 2:
Let the number of pages = n
Let time = t
Step 3:
For direct proportion, you will divide.
[tex]\begin{gathered} \frac{n_1}{t_1}\text{ = }\frac{n_2}{t_2} \\ n_1\text{ = }20 \\ t_1\text{ = 15} \\ n_2\text{ = ?} \\ t_2\text{ = 25} \end{gathered}[/tex]
Step 2:
Substitute the values
[tex]\begin{gathered} \frac{20}{15}\text{ = }\frac{n}{25} \\ \text{Cross multiply} \\ 15n\text{ = 500} \\ n\text{ = }\frac{500}{15} \\ \text{n = 33}\frac{1}{3}\text{ pages.} \end{gathered}[/tex]
Final answer
[tex]She\text{ will read 33}\frac{1}{3}\text{ pages in 25 minutes}[/tex]
