Question

The cost of wood is Rs. 1500 per cu.m. A certain cube of that wood was bought for Rs 786. Find the edge of the cube.

Answer 1

Given cost of solid cubical block = Rs 256 Thus surface area of cubical block = (256/ 500) = 64/125 sq m Recall the formula of surface area of cube = 6(a)2 where ‘a’l is the length of the cubical block. 6(a)2 = 64/125 a = √(64/(125 x 6)) = 29.21 cm Volume of cube = a3 cubic units = (29.21)3 = 24927.5 cu cm