There are five numbers arranged in a column in ascending order. The average of the first three numbers is 34, the average of the last three numbers is 45, and the average of these five numbers is 40. The middle number in this column is What is the number of digits.
有五个数按从小到大的顺序排成一列，前3个数的平均数是34，后3个数的平均数是45，这五个数的平均数是40，这一列数中的中位数是多少．
<gadget id="calculator">34 * 3</gadget>
<output>102</output>

<gadget id="calculator">45 * 3</gadget>
<output>135</output>

<gadget id="calculator">102 + 135</gadget>
<output>237</output>

<gadget id="calculator">40 * 5</gadget>
<output>200</output>

<gadget id="calculator">237 - 200</gadget>
<output>37</output>

<result>37</result>