ttan_kwook ttan_kwook

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riddlefaces  ⓗⓤⓜⓐⓝⓔ If it were easy. Everyone would do it. 正義と文明化人類 Equality creates balance "All things are difficult before they are easy."

The above cuboid that is 7dm long, 5 dm wide and 3dm high has square holes of length 1 dm in the centre of each of the faces of the cuboid. The holes cut through the length of each face of the solid. Find the total of the surface areas of this solid.(it is a problem of junior high school or O level Math Book volume one )

A. 136 dm²
B. 142 dm²
C. 184 dm²
D. 188 dm²
E. 198 dm²

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Even their teachers cannot solve it.
97% cannot solve it.
3% can solve it.

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