A monument has $50$ cylindrical pillars each of diameter $50$ $\mathrm{cm}$ and height $4 \mathrm{m}$. What will be the labour charges for getting these pillars cleaned at the rate of $50$paise per sq.$\mathrm{m}$? ( use $\pi =3.14$ )
 

Two iron sheets Spherical Shape each of radius$3$$cm$ are immersed in the water contained in a cylindrical vessel of diameter $12$$cm$ the level of the water in the vessel will be raised by?

The radii of the base of a cylinder and a cone are in the ratio $\sqrt{3}:\sqrt{2}$  and their heights are in the ratio  $\sqrt{2}:\sqrt{3}$ Their volume are in the ratio of:

A rectangular sheet of metal is $40 \mathrm{cm}$ by $15 \mathrm{cm}$. Equal squares of side $4 \mathrm{cm}$ are cut off at the corners and the remainder is folded up to form an open rectangular box. The volume of the box is