Question

Andy has a collection of movie dvds. in andys collection 3/5 of the dvds are action 1/4 of the dvds are comedy. andy said that 4/9 of his collection is action or comedy. cynthia said that andy made an errer. explain wether andy is correct or incorect and why.

Answer 1

This question is based on greatest common multiple.

Answer:

Cynthia is right that Andy made an error.

Explanation:

As per Andy, action dvds are =
`(3)/(5)`

And comedy dvd's are =
`(1)/(4)`

So, in total these become =
`(3)/(5)+ (1)/(4)`

=
`(12+5)/(20)` =
`(17)/(20)`

This is not 4/9 as per Andy.