Which of the following sets of possible side lengths does not form a triangle?
22, 21, 42
3, 4, 5
5, 6, 10
4, 5, 15
Please help :)

Ben works in his dads bakery packing bagels each package can have no more then 16 bagels 3/4 of the bagels in each package are plain what other fractions could represent the part of the bagels in each package that will be plain