Cory accidentally stumbles across a small cache of revealing clothing and comes to believe that his mother is having an extramarital affair.
Cory and Eric find out Amy has been lying about going to bowling and think she is having an affair. Mr. Feeny gives a math riddle to the class and Minkus gets it wrong while Topanga gets it right. Cory spends time trying to figure out the answer.—Psycho697186