If your parents give you $20 per week and $1.50 per chore, how many chores would you have to do to e

If your parents give you $20 per week and $1.50 per chore, how many chores would you have to do to earn a total of $33.50 that week?

Let c be the number of chores. We're given the equation:
1.50c + 20 = 33.50

To solve this equation for c, we type it in our search engine and we get:
c = 9