One minute of rope skipping, the average number of Xiaohua's two jumps is 120, so that the average number of three jumps reaches 125, how many times does she have to jump for the third time.
一分钟跳绳，小华两次跳的平均数是120，要使三次跳的平均数达到125，她第三次要跳多少个．
<gadget id="calculator">125 * 3</gadget>
<output>375</output>

<gadget id="calculator">120 * 2</gadget>
<output>240</output>

<gadget id="calculator">375 - 240</gadget>
<output>135</output>

<result>135</result>