Question

Q4. P, Q and R can do a piece of work in 18, 27 and 36 days respectively. They started the work together but P left 4 days before the completion of the work while Q left 6 days before the completion. For approximately how many days did R work? ​

Answer 1

Answer:

Countable nouns (or count nouns) are those that refer to something that can be counted. They have both singular and plural forms (e.g. cat/cats; woman/women; country/countries). ... Uncountable nouns can't be preceded by a or an. Many abstract nouns are typically uncountable, e.g. happiness, truth, darkness, humour.