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This should not be an ordinary math problem, right? It's wrong to ask them. What is the answer?
This is an entertainment topic, not difficult.

Three McDonald's drinks =30, so one = 10.

The second one is a drink+two hamburgers =20, so hamburgers =5.

Third, Hamburg +4 French fries =9, so one French fries is 1.

Then it will be easy in the end.

Hamburg+French fries x coke = 5+1x10 =15.

Hope to adopt.