Jed says to Blake: "If you mow my lawn, I will pay you $30. Blake says nothing and mows Jed's law.

1. Jed owes Blake $30 because the contract is consistent with public policy. 2. Jed owes Blake $30 because the contract is unilateral and Blake accepted the offer and performed by mowing the lawn. 3. Jed owes Blake $20 under quasi contract because Blake performed without accepting Jed's offer, and $20 was the appropriate amount under a restitution theory.

4. Jed does not owe Blake any money for mowing the lawn because there was no consideration.