Question

If 1/4 of the 7th graders got an A on the test and 2/5 of them got a B, that fraction of the students got an A or B?

Answer 1

Answer:
`(13)/(20)`

Explanation:

Given: Fraction of 7th graders got A =
`\frac14`

Fraction of 7th graders got B =
`\frac25`

The fraction of the students got an A or B = Fraction of 7th graders got + Fraction of 7th graders got B

`=\frac14+\frac25\\\\=(5+2(4))/(5*4)\\\\=(5+8)/(20)\\\\=(13)/(20)`

Hence, the required fraction:
`(13)/(20)`