Seems like an old Chinese question, a word game.
The pizza cost $25.
The delivery boy kept $2.00 for a tip.
They paid $9.00 each, 9 X 3 = $27.00.
It is simple: $25+$2=$27.
What do you want to compare? They didn't give out $10 each, they had already took it back. That's it.
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