Let's call the amount of yards he needs to mown as 'y'. The total value of the car is $4025, since he already have $275 from his father, the rest of the money will be the difference between those values. The rest of the money, he plans to gain by working at a rate of $50 per yard. Writing all of those informations as an equation, we get:
[tex]4025-275=50y[/tex]To find the amount of yards he needs to mow, we just have to solve this equation for 'y':
[tex]\begin{gathered} 4025-275=50y \\ 3750=50y \\ y=\frac{3750}{50}=75 \end{gathered}[/tex]He needs to mow 75 yards to buy the car.
