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HELP WITH THIS MATH QUESTION PLEASE! I WILL GIVE BRAINLYEST

Sarah is having a party. Shes going to buy cookies and donuts for desserts. Donuts come in packs of 9 and cookies come in packs of 6. Sarah needs exactly 42 desserts. She does not want any left over.

a. how many packs of cookies and donuts does she need to buy to get 42 desserts? (only show one way)

b. how many different ways are there for her to buy cookies and donuts?​