How many silver coins, 1.75 cm in diameter and of thickness 2 mm, must be melted to form a cuboid of dimensions `5. 5 c mxx10 c mxx3. 5 c m`?

Explanation

let the no of coins be `n`

l`n*vol` of silver coins = vol of cuboid

`n*pi*r^2h= L*B*H`

`n= (L*B*H)/(pi r^2 h)`

`n = (5.5*10*3.5*2*2)/(22*1.75*1.75*0.2)`

`=400`