Question

An arborist examined trees in an orchard to see if they were infected with a virus. 10 out of 40 trees were infected with the virus. What percentage of the trees were infected? Write your answer using a percent sign (%).

Answer 1

25 % of trees are infected.

Explanation:

It is given that there are 40 trees in total.

Out of these 40; 10 are infected with virus.

The ratio of number of trees infected to number of trees in total is given by,

=
`(10)/(40)` =
`(1)/(4)` = 0.25

The percent form is given as,

=
`(number of trees infected)/(total number of trees)(100)`

=
`(10)/(40)(100)`

=
`(0.25)(100)`

= 25 %

Thus, number of trees infected are 25%.