New Burger King Promotion Gives br Students Free Whoppers for Studying To win the sandwich, you must answer a br question related to a variety of subjects. These include literature, br math and science. Through April 20, Burger King will post the br daily question on their social media channels. To record an answer, you must place br an order through the chain's phone app. Solving BK's following question or equation br will enable you to gain the promo code. Parental consent is needed for students br between the ages of 13 and 17. The promotion is a one-time offer, meaning br there is one free Whopper per student.