Show your work please step by step:

Alex is trying to decide what show to watch next on Netflix. Alex selects one from the 'Recommended for Alex' list, on which there are 40 shows. The shows fall into three categories: Superhero shows (20 of them), comedy shows (15 of them), and informational shows (5 of them); no show falls into more than one of these categories. Of these 40 shows, 30 of them are live-action and 10 of them are animated; no show is both live-action and animated.

a) Alex has noticed that there are 6 animated super hero shows, but he's not in the mood for either an animated show or a super hero show (and CERTAINLY not in the mood for an animated super hero show). How many choices does Alex have left if he eliminates all of these shows? Show your work step by step please

b) If there are 13 shows which are animated or informational (or both), then how live action comedies are there? Show your work step by step please