Among the following numbers: 3, 5, 7, 4, 9, 1, 6, 10, what is the sum of the second number from the left plus the fourth number.
下列数字中：3，5，7，4，9，1，6，10，从左边数第二个数加第四个数的和是多少．
<gadget id="calculator">5 + 4</gadget>
<output>9</output>

<result>9</result>