Three students participated in the one-minute rope skipping competition, Xiaohong jumped 140 times, Xiaoli jumped Xiaohong's (6/7), and Xiaojing jumped Xiaoli's (3/4). How many times did Xiaojing dance?
三个同学参加一分钟跳绳比赛，小红跳了140个，小丽跳的是小红的(6/7)，小晶跳的是小丽的(3/4)．小晶跳了多少个？
<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">140 * (6/7) * (3/4)</gadget>
<output>90</output>

<result>90</result>