McDaniels sells chicken nuggets in batches of x and y nuggets. Alice walked inside a McDaniels and asked the cashier, “May I have 59 chicken nuggets?” The cashier replied, “Sorry, we cannot make that amount, but we can fulfill any order greater than that and most orders less than that.” Alice said, “It’s okay, I wasn’t that hungry anyway, may I have 25 chicken nuggets instead?” The cashier shook his head and replied, “We can’t make that either.” Alice responded, “Ok, can I have 20?” The cashier once again told Alice that McDaniels could not complete her order. What is the value of x+y? Assume that McDaniels will use any combination of their two sizes to fulfill an order
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By the Chicken McNugget Theorem, x y − x − y = 5 9 . By adding 1 to both sides, this can be factored into ( x − 1 ) ( y − 1 ) = 6 0 . This gives 6 possible distinct values of ( x , y ) : ( 2 , 6 1 ) , ( 3 , 3 1 ) , ( 4 , 2 1 ) , ( 5 , 1 6 ) , ( 6 , 1 3 ) , and ( 7 , 1 1 ) . Only one of these pairs, ( 3 , 3 1 ) , cannot make both 2 0 and 2 5 .