Question

The barrel of fountain pen,cylindrical in shape,is 7cm long and 5mm in diameter.a full barrel of ink in pen will be used up when writing 310 words on an average. How many words would use up a bottle of ink containing one-fifth of a litre? Answer correct to the nearest 100 words. Answer:-45100

Answer 1

Hey this is ur answer
Length of cylindrical shaped barrel =7cm
Dia=5mm 5/10 =.5cm radius =. 25cm
Volume =
$\pi {r}^{2} \: h$
=
$\frac{22}{7} \: {.25}^{2} \: 7 = 1.375 {cm}^{3}$

Volume of ink in bottle =1/5th of 1 litre
1/5 litre
1000/5cm³= 200cm³

In this ink cylindrical barrel can fill =200/1.375=145.46
BY one barrel words can be write =310
BY 145.46x310=450926