Answer:
![3d=81](https://img.qammunity.org/2020/formulas/mathematics/high-school/8jwkoyuiqkdwvsr9ma2nv42nhaibdmfnjg.png)
Explanation:
Given : Kojo wants to be an author. To improve his writing skills, every day after school he writes 3 pages of a story he is working on.
Kojo has been writing his story for d days.
Then, the total number of pages he wrote = 3d
If has a total of 81 pages completed, then the equation describe this situation will be :-
![3d=81](https://img.qammunity.org/2020/formulas/mathematics/high-school/8jwkoyuiqkdwvsr9ma2nv42nhaibdmfnjg.png)