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Moni's room is 20ft long by 15 ft wide by 9 ft high. surface area?

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Surface area = 2(lw + lh + wh)
= 2(20*15 + 20*9 + 15*9)
= 2(300 + 180 + 135)
= 2(615)
= 1230 square feet

Therefore, the surface area of Moni's room is 1230 square feet.

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