Cup should be 10 after all 3C=30 therefore C=30/3=10.
For the Burger you get 5 because 10+2B=20 B=(20-10)/2=5.
From 5+2F=9 F=(9-5)/2 you get 2 for the fries.
But since there are two packs of fries on the picture one pack of fries really is just worth 1.
So in total: 5+1*10=15 you're welcome!
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