Acopy machine makes 162 copies in 4 minutes and 30 seconds. how many copies does it make per minute?

162 copies = 4.5 mins

x copies = 1 minute

Cross multiply:

4.5x = 162

Divide:

x = 36

It makes 36 copies per minute. 

The copy machine made 162 copies in 4.5 minutes. So what we need to do is divide the number of copies by the number of minutes to find how many copies were made per minute.
162/4.5=36

The machine made 36 copies per minute.