Math in Daily Life: Breakfast Restaurant Cashier

Discrete Mathematics Level 3

I own a restaurant. At breakfast today I have 150 customers. On my cash register, there are records of the orders made today. The screen is cracked, and I need to figure out what is listed in the cracked part of the screen. The screen shows that:

Eggs ordered: x
Bacon ordered: y
PBJ ordered: z
Eggs and bacon ordered: 40
Eggs and PBJ ordered: 20
Bacon and PBJ ordered: 25
Eggs, bacon, and PBJ ordered: 10

What is x+y+z?


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