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504/11
Diện tích xung quanh là:
(8+5)x2x4,5=117(m2)
Vì không thể quét vôi được sàn nhà, nên chỉ sơn được 1 mặt đáy là trần nhà.
Diện tích trần nhà là:
8x5=40(m2)
Diện tích cần quét vôi là :
117+40-8=149(m2)
Đáp số:149 m2