Think without ink

Name the compound of silver which is used in the voters ink.

Suppose you are traveling in a train. All of a sudden you recognise your old student who is passing without a solutory remark. What will you think is such a condition?

Change the sentence into indirect speech. Arun says, "There is no ink in the inkpot."

Today we cannot think of food without chillies. These were brought to out country by traders coming from

An ink container of cylindrical shape is filled with ink upto 91% Ballpen refills of length 12 cm and inner diameter 2 mm are filled upto 84% . IF the height and radius of the ink container are 14 cm and 6 cm respectively, find the number of refills that can be filled with this ink.