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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 is used upon writing 3300 words on average. How many words can be written in a bottle of ink containing one-fifth of a litre?

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Mastermind of math class 10th

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Amit rajput

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\\\text{Volume of the barrel}=\pi r^2h=\frac{22}{7}\times(0.25)^2\times7\\=1.375cm^3=\frac{1.375}{1000}L

3300 words can be written with 0.001375 L of ink

So with 1L of ink 3300/0.001375 words can be written=2400000

So with 1/5th of a litter 2400000/5 words can be written=48000

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