67. How many iron rods, each of length 7 m and diameter 2 cm can be made out of 0.88 cubic metre of iron?
A. 400 B.40
C.4000 D.10
Answer:
Volume of 1 rod = (( 22/7) x (1/100) x (1/100) x 7 ) cu.m = 11/5000 cu.m
Volume of iron = 0.88 cu. m.
Number of rods = (0.88 x 5000/11) = 400.
