1.

A box is constructed from a rectangular metal sheet of 21 cm by 16 cm, by cutting equal squares of sides x from the corners of the sheet and then turning up the projected portions. The value of x for which volume of the box is maximum, is

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A box is constructed from a rectangular metal sheet of 21 cm by 16 cm, by cutting equal squares of sides x from the corners of the sheet and then turning up the projected portions. The value of x for which volume of the box is maximum, is



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