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Mathematics 14 Online
OpenStudy (danielbarriosr1):

Please help me

OpenStudy (danielbarriosr1):

Ann baked 90 cookies, and now she needs to frost them. The top of each cookie is 3 square inches. If a can of frosting can cover 20 square inches, how many cans of frosting does Ann need?

OpenStudy (anonymous):

you mean that one can can cover an area of 20 inch ² , right ?

OpenStudy (danielbarriosr1):

I think so

OpenStudy (anonymous):

So, you need to find the entire area that needs to be frosted first. If each cookie has an area (that needs to be frosted) of 3 inch² , then what is the area of 90 cookies ?

OpenStudy (danielbarriosr1):

270 inches^2

OpenStudy (anonymous):

Yes, correct, 270... So, you know that 1 can, covers 20" , so to find your answer, tell me how many of 20 is there in 270 ?

OpenStudy (danielbarriosr1):

13.5

OpenStudy (anonymous):

I would also say that your answer should be an whole number, because you can't buy a half a bottle. You would need 13.5 though, not 14, so idk.

OpenStudy (danielbarriosr1):

13

OpenStudy (danielbarriosr1):

There is not 13 in the possible answers so it should be 14

OpenStudy (anonymous):

No, definitely not 13... if you needed an amount of 13.5 bottles you would buy 14 bottles , not 13 bottles.

OpenStudy (danielbarriosr1):

Oh

OpenStudy (anonymous):

Also, when you wound up 5 6 7 8 9 they round up to the next ten, for example 29≈30

OpenStudy (anonymous):

Can you post all the options, though, please ?

OpenStudy (danielbarriosr1):

A. 2 B. 7 C. 14 D. 24

OpenStudy (anonymous):

Then only 14...

OpenStudy (danielbarriosr1):

Thanks

OpenStudy (anonymous):

You welcome !

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