Question

Ten men working for $6$ days can complete $5$ copies of a books. If there are $8$ men working to complete $4$ copies of the books, how many days it will take?

Answer 1

given

$\to$ 10 men working for 6 dyas can complete

5 copies of a book

$\to$ number of copies filled by 10 members in 1 day

is 1/6

$\to$ work done by 10 numbers on one book is $1/5$

$\to$ if 8 men work for 4 copies in x days then

$\to$ work done on one book per one days is

$\frac{1}{8}\times \frac{1}{4}\times \frac{1}{x}$

but work done on one book by one person

is same

so, $\frac{x}{32}=\frac{1}{300}$

$x=9.375$ days