Aspire Faculty ID #16423 · Topic: NIMCET 2009 · Just now
NIMCET 2009

A box open at the top is made by cutting squares from the four corners of a $6 \times 6$ m sheet. The height of the box for maximum volume is:

Solution

Volume: $V = x(6-2x)^2$ 
Differentiate: $\dfrac{dV}{dx} = 0$ gives $x = 1$ 
So height = $1$ m → not in options. 
Closest correct is None of these.

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