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Question

7) The side of cube whose surface area is 2400 sq. cm is
(a) 60 cm
(b) 40 cm
(c) 10 cm
(d) 20 cm

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Solution

Let the length of each side of cube = s cmNow, TSA of cube = 2400 cm26s2 = 2400s2 = 24006s2 = 400s = 400s = 20So, length of each side of cube = s = 20 cm

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