Question

In a class, 4/5 of the students have mathematical instruments. 1/4 of these students have lost their protractors. What fraction of students in the class has protractors?​

Answer 1

`(11)/(20)`

Explanation:

`(4)/(5) - (1)/(4)` Subtract the students who don't have protractors from the students who have mathematical instruments.

`(11)/(20)`

Answer 2

9514 1404 393

Answer:

3/5

Explanation:

We assume that every student with mathematical instruments who hasn't lost their protractor will have a protractor.

If 1/4 of the students with instruments lost their protractor, then the remaining 3/4 of students with instruments still have their protractors. The fraction of the class with protractors is ...

(3/4)(4/5) = 3/5

3/5 of the students in the class have protractors.