Answer:
![80+20x>200](https://img.qammunity.org/2019/formulas/mathematics/middle-school/gxh7vt9zvy60inctww1oiublkf2d9hkl84.png)
Explanation:
Let x represents the number of lawns that Brad must mow .
Given: The total amount of money Brad has = $80
The amount money Brad paid for every lawn = 20
Then the total money Brad has is given by :-
![80+20x](https://img.qammunity.org/2019/formulas/mathematics/middle-school/q68m7zu8cs3cksqqdkuydng7bil0sx1r23.png)
Also, The total amount of money Trevor has = $200
Now, the inequality can be solved for the number of lawns, x , that Brad must mow in order to have more money than Trevor is given by :-
![80+20x>200](https://img.qammunity.org/2019/formulas/mathematics/middle-school/gxh7vt9zvy60inctww1oiublkf2d9hkl84.png)