Question

A barrel of a fountain-pen is cylindrical in shape. The barrel is 7cm long. Diameter of the barrel is 5mm. A full barrel of ink in the pen will be used to write 330 words on an average. If a bottle of ink contains one fifth of a litre, then how many words can be written?

Answer 1

Answer:

Explanation:

Volume of a barrel =   22/7 ×0.25×0.25×7=1.375 cm  cube

Therefore, total number of barrels that can be filled from the given volume of ink =   200/1.375

So, required number of words =   200/1.375×330=48000

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Answer 2

Answer:

48000 words

Explanation:

volume of barrel=πr²h

h=7cm

r=0.5/2

volume of barrel=$\frac{22}{7}$*0.5/2*0.5/2*7

volume=1.375 cm³

no. of barrels=$\frac{200}{1.375}$=145.45

no. of words=145.45*330=48000 words