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geometry intermediate

Problem

A barn with a roof is rectangular in shape, yd. wide, yd. long and yd. high. It is to be painted inside and outside, and on the ceiling, but not on the roof or floor. The total number of sq. yd. to be painted is:
(A)
(B)
(C)
(D)
Solution
The walls are and in area, and the ceiling has an area of .
Final answer
D