Question

Students were asked to choose their favorite subject. If 2/10 the students

chose history and 2/10 chose biology, what fraction chose either history or
biology?

Answer 1

`(4)/(10)`, simplified to
`(2)/(5)`

Explanation:

`(2)/(10)` +
`(2)/(10)` =
`(4)/(10)` ÷
`2` =
`(2)/(5)`