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I got my answer by multiplying 27 and 5 to get the answer 135 then you have to multiply 135/1 and 3/5 to get your answer 405/5 and next divide 405 to 5 and get 81and finally subtract 81 from 135 and get your final answer 54 room empty.

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i got 54

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54 rooms are empty because there are 27 rooms on each floor and there are 5 floors and 5 times 27 is 135 and since it asks about how many rooms are empty I took the 3 in 3/5's and multiplied 3 times 27 and got 81 and subtracted that from 135 and got 54.

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I multiplied 27 times 5 and l got 135 then I multiplied 27 time 3 and got 81 then I subtracted 81 from 135 and got 54 empty rooms

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i got 54

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54 rooms were empty because:
27 rooms on each floor. There are 5 floors. 27 x 5 is 135 or 135/1.
135/1 x 3/5 will tell you how many were full because it says the word of. the answer is 405/5 or 81 rooms full. 135 - 81 is 54 rooms empty

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54 rooms are empty because there are 27 rooms on each floor and there are 5 floors, and if you multiply that you get 135. 3/5 of the rooms are full. Divide 135 by 5 and you get 27. Take 27 and multiply it by 3 and you get 81. That's how many rooms are full. Subtract 81 by 135, and you get 54. That's how I got my answer.

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I found the answer by starting with multiplying 27 x 5 because there are five rooms of 27 floors but 5x27=135 so 3/5 of 135 rooms are in use but we need to find how many rooms aren't in use so 27x3=81 135-81=54. 54 rooms aren't in use

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I found this answer by multiplying 5 times 27 which is 135 and since it says "of" I need to multiply so 3/5 times 135 is 81.