I don’t know shop serves plain and chocolate doughnuts at a ratio of 5 to 3 based on this ratio how many chocolate doughnuts will be served if there are a total of 120 donuts served

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  45 chocolate donuts

Step-by-step explanation:

The fraction that are chocolate doughnuts can be determined from the ratio to be ...

  chocolate / total = 3 / (5 +3) = 3/8

Then the number of chocolate doughnuts is ...

  chocolate = 3/8 × total = (3/8) × (120) = 45

45 chocolate doughnuts will be served.