The barrel of a fountain pen of cylindrical tank is 7cm long and 5mm in diameter. A full barrel of ink in the pen will be used for 330 words in an average. How many words used up by a bottle of ink containg 1/5 of litre?
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volume of ink barrel = pi r^2 h
=22/7 × 5/20 ×5/20×7
=11/8cmcube
11/8 cm cube can write 330 words
then 200cm cube can write
330×8/11 ×200
=30 ×8×200
=48000 words
=22/7 × 5/20 ×5/20×7
=11/8cmcube
11/8 cm cube can write 330 words
then 200cm cube can write
330×8/11 ×200
=30 ×8×200
=48000 words
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