Many number mistakes – iTooch 5th Grade Math Review

Which expression matches the problem? Maggie has 22 students in her class. She is bringing donut holes as a birthday treat. Each student will get 3 donut holes. If she brings 100 donut holes, how many extra donut holes are left? A: 3 x 23-100 B: 100-3 x 23 C: 100 - (3 x 23) D: Both B and C are correct. This is the second problem that I have seen like this, I won't use this app until this is fixed.
Review by Mmhmm kay on iTooch 5th Grade Math.