There are 6 numbers, their average is 120, the average of the first 4 numbers is 114, and the average of the last 3 numbers is 133, what is the fourth number?
有6个数，他们的平均数是120，其中前4个数的平均数是114，后3个数的平均数是133，第四个数是多少？
<gadget id="calculator">114 * 4</gadget>
<output>456</output>

<gadget id="calculator">133 * 3</gadget>
<output>399</output>

<gadget id="calculator">120 * 6</gadget>
<output>720</output>

<gadget id="calculator">399 - 720</gadget>
<output>-321</output>

<gadget id="calculator">456 + (-321)</gadget>
<output>135</output>

<result>135</result>