Given that 1 cubic cm of marble weighs 0.25 kg, the weight of marble block 28 cm in width and 5 cm thick is 112 kg. Find the length of the block.

Given,

Weight of 1m³ marble = 0.25 kg

Weight of marble 28 cm wide and 5 cm thick = 112 kg

Let length of block = l cm

Then volume of block = l×28×5 cm³ = 140 l cm³

Weight of block = 140 l ×0.25

= 112 = 140 l ×0.25

= l =