The number of iron rods, each of length 7 m and diameter 2 cm that can be made out of 0.88 cubic metres of iron is (π=22/7)

Question

The number of iron rods, each of length 7 m and diameter 2 cm that can be made out of 0.88 cubic metres of iron is \(\big(π=\frac{22}{7}\big)\)

(a) 300 

(b) 400 

(c) 500 

(d) 600

Answer 1

(b) 400

Number of iron rods = \(\frac{\text{Volume of iron}}{\text{Volume of one iron rod}}\)

= \(\frac{0.88}{\frac{22}{7}\times(0.01)^2\times7}\) = \(\frac{0.88}{22\times0.0001}\) = 400         (∵ Radius = 1 cm = 0.01 m)