During the "March 15" period this year, there were 306 people who complained about the quality of goods, 6 people less than twice the number of complaints in the same period last year. How many people complained in the same period last year?
今年"3.15"期间对商品质量投诉的有306人，比去年同期投诉的2倍少6人，去年同期投诉的有多少人？
<gadget id="calculator">306 + 6</gadget>
<output>312</output>

<gadget id="calculator">312 / 2</gadget>
<output>156</output>

<result>156</result>