Rylee is bored and decides to count the number of leaves falling off the tree in her backyard. 7 leaves fall in the first hour. For the second and third hour, the leaves fall at a rate of 4 per hour. What is the average number of leaves which fell per hour?
7 leaves fell in the first hour.
4 leaves fell in the second hour.
4 leaves fell in the third hour.
The total number of leaves that fell during the 3 hours is 7 + 4 + 4 = 
<gadget id="calculator">7+4+4</gadget>
<output>15</output>
15 leaves.
The average number of leaves that fell per hour is 15 leaves / 3 hours = 
<gadget id="calculator">15/3</gadget>
<output>5</output>
5 leaves per hour.

<result>5</result>