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I received the same e-mail yesterday. I know that 25 + 3 + 2 = 30, so there is really no dollar missing.
But when I look at the idea that each man originally gave $10, and each man was given back one dollar of that, that really does leave each man giving only $9.00. But each man paid $8.3333333333333 for the room and received back $1.00.
This is a situation of knowing whether to add, subtract, or multiply.
You simply have to subtract for this problem. $30 - 25-3-2=0.
Nothing is missing.
Is there a better answer?