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A solid rectangular brick is to be made ...

A solid rectangular brick is to be made from 1 cu feet of clay. The brick must be 3 times as long as it is wide. Thewidth of brick for which it will have minimum surface area is a.Then `a^3` is (A) `(2/9)^(1/3)` (B) `(2/9)` (C) `8/729` (D) `3/2`

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