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May 30, 2016
Posted by **student** on Friday, August 24, 2007 at 10:40pm.

a. 452

b.480

c.488

d.492 1/2

I would say the answer is c - 488. Would that be right?

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**brie**, Friday, August 24, 2007 at 10:43pmthe * means times, right?

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**brie**, Friday, August 24, 2007 at 10:49pmAssuming it does, I multiplied and got 10120.alotmore#s. Did you get the same thing? Did you round after that? (I multiplied 16 20/21 and 28 3/7)

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**~christina~**, Friday, August 24, 2007 at 11:10pmI really don't know if you copied the question wrong or something because when I did the question 3 times total and keyed the fractions into my calculator I get the same answer of

485.45 so I don't know if either the multiple choice is incorrect or the copied question is wrong but something is funny.- math -
**~christina~**, Friday, August 24, 2007 at 11:53pmPosting my work on this:

16 20/21*28 3/7 - 4 13/25 + 8 2/47 =

(356/21)*(199/7)-(133/25)+(378/47)=

(70844/147)-(133/25)+(378/47)=

484.654

(this is most likely the answer to**this**question that you posted [it may have been copied wrong] because I'm using my TI-83 Plus graphing calculator to just straight punch in the fractions(it can handle large fractions) while before I was using a normal calculator)

**note it's not there as a choice so I personally feel that it's a problem with the question/ multiple choice**

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**brie**, Friday, August 24, 2007 at 11:16pmWhat's a common denominator of 25 and 47?

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**~christina~**, Friday, August 24, 2007 at 11:19pmI'm not sure but a foolproof way to go and use a denominator common to both is to go and

multiply both numbers

here: 25x47=1175

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**Anonymous**, Friday, August 24, 2007 at 11:23pmthanks! but now I just realized that if I find the common denominator of those two numbers, I'm not following PEMDAS, so hold on, I have to rethink this.

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**brie**, Friday, August 24, 2007 at 11:30pmOkay, I have to get off the computer now, but I hope this which I figured so far will help you find the answer:

I multiplied 16 20/21 and 28 3/7. I got the fraction 212532 over 21.

Next, you subtract 4 13/25 from 212532 over 21, I think. Once you've done that, add 8 2/47, and you should get a matching answer. Hopefully. Or else there's seriously something wrong about the whole question, like, it had to have been misprinted or typed incorrectly or something. Good Luck! I'll work on it more tonight and I'll check back probably tomorrow.- math -
**~christina~**, Friday, August 24, 2007 at 11:45pmBrie the 2 fractions multiplied is NOT what you got...are you using a calculator?

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