Answer:
Every pencil cost 4$ alll of the pencils together are 12$
Explanation:
All you had to do is figure out how much money you wasted on buying the three pencils and from that you have gotten 12$ that you wasted and then you have 3 pencils and so then just divide 12 divided by three which equals 4 so that means that 4$ is your answer.
Each Pencil Cost 4 Dollars
First you can subtract 21 by 9 to get 12 dollars which shows how much he spent.
Second you can divide 12 by 3 to get 4 dollars spent. So he spent 4 dollars on each pencil.
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