The school held a rope skipping competition. Zhang Hua jumped 135 times, 18 times less than Li Gang. How many times did they dance together?
学校举行跳绳比赛．张华跳135下，比李刚少18下，两人一共跳多少下？
<gadget id="calculator">135 + 18</gadget>
<output>153</output>

<gadget id="calculator">135 + 153</gadget>
<output>288</output>

<result>288</result>