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How many iron rods, each of length 7 mts and diameter 2 cms can be made out of 0.88 cubic metre of iron ?

A.500
B.600
C.300
D.400
Answer and Feedback
Answer:D
Feedback:Given length of iron rod =7 mts and and diameter of rod = 2 cms
=> r = 1/100 mts
Therefore, Volume of one rod = πr^2h cu. m = (22/7×[1100]^2× 7)cu. m
= 11/5000 cu. m
Given volume of iron = 0.88 cu. m
Therefore, Number of rods = (0.88×5000/11) = 400.

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