Divide the $150 by $30 to find out how many lawns Miguel has to mow to make the same as his weekly salary.
150 divided by 30 = 5
If he mows five lawns he makes exactly the same as his weekly salary.
The question is, when does he start making more money than $150 from the number of lawns he mows.
If 5 lawns per week make the same, than six lawns per week (or more) would earn him more than $150.