Zhenhai Yale School bought 5 footballs and 8 basketballs for the first time, and the total cost was 51 yuan; the second time, they bought the same 8 footballs and 5 basketballs, and the total cost was 66 yuan. How much does it cost to buy 1 football and 1 basketball?
镇海雅乐学校第一次买了5个足球和8个篮球，共用了51元；第二次又买了同样的8个足球和5个篮球，共用了66元．如果买1个足球和1个篮球共用多少元．
<gadget id="calculator">51 + 66</gadget>
<output>117</output>

<gadget id="calculator">5 + 8</gadget>
<output>13</output>

<gadget id="calculator">117 / 13</gadget>
<output>9</output>

<result>9</result>