Question

Out of 40 books checked out of the library first period, 18 of them were non-fiction of 100 students visit the library in 2e period, how many can you expect tocheck out a non-fiction book?

Answer 1

In the first period 18 books were non-fiction out of 40 books. In percentaje, we have that

`\begin{gathered} 40\text{ books ----- 100 \%} \\ 18\text{ books ------ x} \end{gathered}`

and x is given by

`\begin{gathered} x=((18)(100))/(40) \\ x=(1800)/(40) \\ x=45\text{ \%} \end{gathered}`

that is, 18 non-fiction books correspond to 45% of 40 books.

With this result, we can expected that 45% of 100 students prefer non-fiction books. That is

`100*45\text{ \%=100}*0.45=45\text{ students}`

that is, 45 students check out non fiction books.