Use a truck to transport two piles of coal, the first pile is 36 tons, and the second pile is 27 tons. This truck transported 4 times on the first day and 3 times on the second day, just in time to transport all the coal. How many tons does the car transport on average each time?
用一辆载重汽车运两堆煤，第一堆36吨，第二堆27吨，这辆汽车第一天运了4次，第二天运了3次，正好把煤全部运完，这辆汽车平均每次运多少吨？
<gadget id="calculator">36 + 27</gadget>
<output>63</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

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

<result>9</result>