Posted by **allen** on Friday, February 25, 2011 at 7:36pm.

At the school store, 5 pens sell for $1.25. Which proportion will help find the cost of 12 pens?

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**Ms. Sue**, Friday, February 25, 2011 at 7:38pm
What are your choices?

What do you think the answer is?

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**allen**, Friday, February 25, 2011 at 7:41pm
a. 5/12=1.25/x

b. 5/12=x/1.25

c. 5/x=12/1.25

d. x/5=12/1.25

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**allen**, Friday, February 25, 2011 at 7:42pm
I say its c

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**Damon**, Friday, February 25, 2011 at 7:51pm
5 pens / 12 pens = 1.25 dollars/x dollars

It helps to write the units, pens and dollars.

so

I claim a is correct

although I myself would have written the same thing as

5 pens/1.25 dollars = 12 pens/x dollars

which comes out the same

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**Anonymous**, Friday, February 25, 2011 at 11:11pm
5 pens cost 1.25$

1.25/5=0.25$ Price of one pen

12*0.25=3$ Price of 12 pens

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