Question

The cost of polishing 35 identical wooden cubical boxes at the rate of 20 rs per cm${}^2$ is 1,51,200 rs. find the edge of each cubical box

Answer 1

Cost of painting 1 cube = $\frac{151200}{35}=4320$ $Rs.$

Surface area of 1 cube = $\frac{4320}{20}=216$ $c{m}^2$

Therefore,

$6a^2=216$

$a^2=36$

$a=6$

So, side of cubical box = $6$ $cm$.