1 .The radi us of cross-se ct ion of a sol id
cyl indric al rod of iron is 50 cm. The
cylinder is melted down and formed in to six
solid spherical balls of the same radius as that
of the cylinder. The length of the rod (in
meters) will be â€“
5 .Two alloys are made up of both copper and tin.
The ratio of copper and tin in the first alloy is
1 : 3 and in the second alloy is 2 : 5. In what
ratio should the two alloys be mixed, to
obtain a new alloy in which the ratio of tin
and copper be 8 : 3 ?