1.A and B entered into a contract with X. As consent was obtained only because B had deceived or defrauded him. May A ask for annulment of the contract with X?

2.As a joke, A and B executed a deed of sale although they did not intent to be bound at all by the contract. Is the contract valid?

3.If a particular piano is sold for P500,000, what is the object and what is the case?

4.A guardian of A sold As mansion worth P120million for P60 million. May the contract be rescinded on the ground of lesion?

5.A sold his mansion worth P120million to B for only P60 million because A did not know the true value of the house. May the contract of sale be rescinded?