Answer:
It is 4
Step-by-step explanation: I know its four because 72 divided by 18 is four. I also know that 64 divided by 18 is 3.555 which is close to four.
First, take off 4 feet of Stacy's rope, which is 19. (23-4=19). Then, divide 19 by 3. It should equal 6.3...
Answer: 
<u>Add 3x to both sides</u>
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<u>Subtract 15 from both sides</u>
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<u>Divide both sides by 5</u>
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A vat of water and a weighing scale