How many iron rods of length 7m and dia 2cm can be made from the .88 cubic meter of metal?

How many iron rods of length 7m and dia 2cm can be made from the .88 cubic meter of metal?




Solution -

Volume of each rod = Pi * r * r * l
r = 2cm/2 i.e. 1cm or .01 m
l = 7

So volume of rod = (22/7) * .01 *.01 * 7 = .0022 cubic m

Metal volume = .88

Number of possible rod = .88/.0022 = 400

Answer: 400 rods are possible