There is a rope skipping competition on June 1. Xiaohong jumps 100 times in one minute, 20 times less than Xiaoling (4/5). How many times does Xiaoling jump in one minute?
六1举行跳绳比赛，小红一分钟跳了100下，比小玲跳的(4/5)少20下，小玲一分钟跳多少下？
<gadget id="calculator">100 + 20</gadget>
<output>120</output>

<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">120 / (4/5)</gadget>
<output>150</output>

<result>150</result>