Answer:
14
Step-by-step explanation:
you can write an equation to represent the situation:
let x represent the number of lawns he has to mow
then, the monthly profit would be 25x - 100.
in order to make $250, this equation has to be equal to 250:
[tex]25x-100=250[/tex]
now, solve this:
add 100 to both sides
[tex]25x = 350[/tex]
divide both sides by 25
[tex]x = 14[/tex]
he must mow 14 lawns