The average value of five numbers is 100. After adding a number, the average value increases by 2, and when a seventh number is added, the average value increases by 2. What is the seventh number?
五个数，平均值是100，添上一个数后，平均值增加2，再添上第七个数，平均值又增加2，第七个数是多少．
<gadget id="calculator">100 + 2 + 2</gadget>
<output>104</output>

<gadget id="calculator">104 * 7</gadget>
<output>728</output>

<gadget id="calculator">100 + 2</gadget>
<output>102</output>

<gadget id="calculator">102 * 6</gadget>
<output>612</output>

<gadget id="calculator">728 - 612</gadget>
<output>116</output>

<result>116</result>