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 33o words on an average. How many words would use up a bottle of ink containing one-fifth of a litre?
Given,
Length of cylindrical barrel (h) = 7 cm
Diameter = 5 mm
Radius = 
Volume of cylindrical barrel = πr2h = 
∵ 
cm3 volume of barrel is used for writing = 330 words
∴ 
will be used for writing = 
17