Math / Fractions

If 3/8 + 3/4 = $36.35 and the room to cover is 12 ftX 12 ft how much will the total cost be.

I do not want the answer, I want you to explain to me HOW to GET the answer.

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  1. Are you sure this is the entire problem? It doesn't make any sense to me.

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  2. Benjamin and Olivia are putting a new floor in their kitchen. To get the floor up to the
    desired height, they need to add 1 ft of subfloor. They can do this in one of two ways.
    They can put -in. sheet on top of -in. board (note that the total would be ft or 1 ft).
    They could also put -in. board on top of -in. sheet.
    The table below gives the price for each sheet of plywood from a Home Depot store
    on 1/15/04.
    3
    4
    3
    8
    1
    8
    9
    8
    5
    8
    1
    2
    1
    8
    247 2005 Thickness Cost for a 4 ft � 8 ft Sheet
    in. $9.15
    in. 13.05
    in. 14.99
    in. 17.88
    in. 19.13
    in. 21.36
    in. 25.23
    1 in. 28.49
    7
    8
    3
    4
    5
    8
    1
    2
    3
    8
    1
    4
    1
    8
    1. What is the combined price for a -in. sheet and a -in. sheet?
    2. What is the combined price for a -in. sheet and a -in. sheet?
    3. What other combination of sheets of plywood yields the needed 1 -in. thickness?
    1
    8
    3
    4
    3
    8
    5
    8
    1
    2
    4. Of the four combinations, which is most economical?
    5. The kitchen is to be 12 ft �12 ft. Find the total cost of the plywood you have suggested
    in question 4.

    It is number 5 that I am having trouble with.

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  3. i need help with 1 through 5

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    posted by gertrude

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