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See my hint to another responder.
Brent
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dbrenth wrote: the answer was 5!
five factorial. Unless you were yelling at them.
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dbrenth wrote: Can you please explain it to him?
Dear Teacher,
dbrenth is a cocky little so and so, who needs to be taken down a peg or two. 
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And marked down for not completing the solution.
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You teacher was right, and told you the correct result was actually 76.
Could you please tell us why?
"In testa che avete, Signor di Ceprano?"
-- Rigoletto
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I thought the answer was 78.
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42.
"In testa che avete, Signor di Ceprano?"
-- Rigoletto
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Octal
Freedom is the freedom to say that two plus two make four. If that is granted, all else follows.
-- 6079 Smith W.
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Bravo!
"In testa che avete, Signor di Ceprano?"
-- Rigoletto
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If you solve it left-to-right, ignoring precedence order, then the answer is 5. An old TI calculator would give you that answer. Today's windows calculator will not: it says 120 because the multiplication is done first.
"They have a consciousness, they have a life, they have a soul! Damn you! Let the rabbits wear glasses! Save our brothers! Can I get an amen?"
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"5!" = 120
It's a clever nerdy riddle. I like it!
I wonder if I'd have been hassled after math class for giving such an answer?
and I just noticed that Microsoft Excel doesn't recognize factorials.
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And today you learn that nobody likes a smartarse ... 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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OriginalGriff wrote: nobody likes a smartarse
Maybe he should brace himself for the reactions to come?
If you can't laugh at yourself - ask me and I will do it for you.
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Quote: smartarse
I'm owning that.
Brent
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Very clever 
cheers
Chris Maunder
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The teacher was not embarrassed but shocked that any student could be so wrong. The division MUST be carried out before the subtraction. 230 – 220 × 0.5 = 230 – 110 = 120. Try it in any scientific calculator or programming language. You are alone (I hope) in thinking the answer is 5. Are you perhaps joking?
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As with a few readers, you missed the ! after the 5.
Brent
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this is excellent!
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That pesky little exclamation mark...
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Oh, come on! I immediately saw that: 5!=120
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Is it because you are saying 5! (factorial). 230 - 220 x 0.5 = 230 - 110 = 120 which is == 5x4x3x2x1 or 5!.
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Your answer is wrong, but not because of maths but because of your English usage. Your intention is to say the answer is 5 factorial in which case your first sentence would end with:
"and announced that the answer was 5!."
However, by leaving off the period, the exclamation mark ends the sentence, which means you are actually saying the answer is 5.
I realize leaving off the period was deliberate to make the trick work, but it's inaccurate, and we are all engineers here 
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Actually, your teacher realized you are more intelligent than him and he was embarrassed about that so he tried to cover for it by saying you were wrong.
I wouldn't try to stick it to him or prove your correctness I would just let it go. There is really no point in upsetting the guy who gives you your final grade.
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