Help need with some brain teaser for a quiz - Thanks?

I am stuck on the last few questions for a quiz

example 7 D in a W = 7 days of the week

1. 50 S of A
2. 50 is B E on a D B
3. 15 M on a D M C
4. 10 L A L
5. 20 B of C in a N


Any help would be greatly appreciated.
 
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