# You put 500 pieces of paper in a copy machine. When you check back 6 days later, there are only 320 pieces left. How many pieces of paper are being used each day?

##### 1 Answer

The mean usage over 6 days is 30 per day

#### Explanation:

Realistically you do not know. One day may use more than another. For example: they may all have been used on day 5 and none on all the other days.

The mean (average) use is all you can determine.

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Using ratio in fraction format

This is for 6 days but we need the count for 1 day

With ratio what you do to the bottom you also do to the top for multiply or divide. This maintains the correct proportions.

So the