A land cultivator cultivated a total of 28 hectares in the first 4 days and 35 hectares in the next 5 days. How many hectares does this cultivator cultivate on average per day?
一台耕地机，前4天共耕地28公顷，后5天共耕地35公顷，这台耕地机平均每天耕地多少公顷？
<gadget id="calculator">28 + 35</gadget>
<output>63</output>

<gadget id="calculator">4 + 5</gadget>
<output>9</output>

<gadget id="calculator">63 / 9</gadget>
<output>7</output>

<result>7</result>