S Purkayastha Solutions for Chapter: Surface Area and Volume, Exercise 7: BRAIN WORKOUT

The length of a hall is $20 \mathrm{m}$ and width is $16 \mathrm{m}$. The sum of the areas of the floor and the flat roof is equal to the sum of the areas of four walls. Find the height of the wall (in $\mathrm{cm}$). (Correct up to two decimal point)

A solid cylinder has a total surface area of $462 \mathrm{sq}. \mathrm{cm}$. Its curved surface area is one-third of its total surface area. Find the height of the cylinder.