so in the first week Brandon earns $133. In order to find how many more lawns he needs to mow in order to get $287.00. you need to do this:
1: $287 - $133 = $154
2 because Brandon earned $133 already he can subtract that from $287, so now all he needs is $154.
3. if Brandon need $154 he needs to do this:
1- lawn will equal = $7 so to make this simple he needs to do 19 more lawns and see were his money is. If he does 19 more lawns he will earn $133.
2- now that Brandon has $133 he can subtract that from $154 so that is = $21.
4. Brandon now only has $ 21 to pay and $7 * 3 lawns will equal $21.
5: Brandon will mow a total of 22 lawns in order to make $287.