This is easy though I think it is very fun to think about!
S+S+S=30
S+H+H=20
H+F+F=9
H+F*S=?
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Sign up to join this communityThe answer is
15, not 25
since
there's only one bag of fries in the last line, not two.
About half of the puzzles of this type seem to have this trap.