Question

The barrel of a fountain-pen, cylindrical in shape, is 7 cm long and 5 mm in diameter. A full barrel of ink in the pen will be used up on writing 330 words on an average. How many words would use up a bottle of ink containing one fifth of a litre ?

Answer 1

Volume of a barrel = $\frac{22}{7}\times 0.25\times 0.25\times 7=1.375$ $c{m}^3$

Volume of ink in the bottle = $\frac{1}{5}$ litre = $\frac{1000}{5}=200$ $c{m}^3$

Therefore, total number of barrels that can be filled from the given volume of ink = $\frac{200}{1.375}$

So, required number of words = $\frac{200}{1.375}\times 330=48000$