Given:
Amount saved = $52
Amount you earn on each lawn = $4
Let's find how many more lawns you need to mow to reach a total of $74.
Let x represent number of lawns needed to reach a total of $74
We have the equation:

Let's solve for x:

Therefore, you need to mow 5.5 lawns which is approximately 6 lawns to reach a total of $74