Question

The barrel of a fountain pen, cyindrical in the shape is 7 cm long and 5 mm in diameter. A full barrel of ink in the pen is used up on writing 3300 words on an average . How many words can be written in a bottle of ink containing one fifth of a litre.

Answer 1

Answer:

Step-by-step explanation:

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Answer 2

Heya!!

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Height of cylindrical barrel = 7$cm$

Diameter of the cylindrical barrel = 5$mm$ = 0.5$cm$

So, radius of the cylindrical barrel = 0.25 $cm$

Volume of the ink in the barrel = 3.14 × $(0.25)^{2}$ × 7 = 1.375 $cm^{3}$

Also, 1 $cm^{3}$ = 1 $ml$

=> 1.375 ${cm}^{3}$ = 1.375 $ml$

= = = = = = = =

1.375 $ml$ = 3300 words

Therefore, 1 $ml$ = 3300 ÷ 1.375 = 2,400 words

and

1/5 of 1 litre = 1/5 of 1000 ml = 200 $ml$

Therefore, 1/5 of a litre or 200 $ml$ ink will be able to write (2,400 × 200) words.

Hence, 1/5 litre ink will write approximately $480000$ words.

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