Bob and dewei had to paint a house. bob could paint twice as fast as dewei. they would take a total of 12 hours to paint the entire house together. how long would bob take if he was to paint the house by himself?

Bob would take as long as 6 hours to paint the house:
x=12÷2
x=6

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You have 2 sides that are 2 cms and you have 6 sides that are 1/2 cm and you have 4 sides that are 1 cm. the smallest sides are 1/2 the medium sized sides are 1 and the smallest are 1/2. so to find the perimeter you have to add them all up together so your answer will be 11 cm's