In the pattern rope skipping activity, 80 people skipped the long rope, and 40 people skipped the short rope twice as many as the long rope. How many people jump rope?
在花样跳绳活动中，跳长绳的有80人，跳短绳的比跳长绳的2倍少40人．跳短绳的有多少人？
<gadget id="calculator">80 * 2</gadget>
<output>160</output>

<gadget id="calculator">160 - 40</gadget>
<output>120</output>

<result>120</result>