Question

For the Christmas dance ,the dance committee needs three hours of music. Each song is an average of 3.5 minutes . how many song do they need

Answer 1

There are 60 minutes in an hour, 3 hours to fill up, therefore the problem should be 180/3.5.
They need about 52 songs.
Hope this helped!

Answer 2

An hour is 60 minutes

there are three hours so 
60*3=180

how many times will 3.5 go into 180 so 
180/3.5=51.43 or rounded up you get 52 songs (if they're good, they'll play 52 average songs and one half legnth songs)
so they will need 52 songs