Then if the total amount of money Maya has is dollars, it follows that the daily pay for the plumber is and the daily pay for the carpenter is
Now, let us say is the number of days she pays both of them to work.
So we want to solve for
Therefore, Maya has enough money to pay both the plumber and the carpenter for 12 days. Given this, she won't have enough money to last her until her paycheck.
Does this make sense?