Question
Determine the volume of a cube if the total cost to
paint its four walls is Rs. 1280, given that the painting rate is Rs. 5 per square meter.Solution
Let length of side of cubical box be 'x' m Area of four walls = 1280/5 = 256 m2 So, 4x2Â = 256 x2Â = 64 x = 8 cm Desired volume = 8 X 8 X 8 = 512 m3 Hence, option d.
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