In the first three rope skipping competitions, Xiaohua's scores were 135, 146, and 150 respectively. In order to make the average score of the four rope skipping times reach 148, how many times must Xiaohua jump for the fourth time?
在前三次跳绳比赛中，小华的成绩分别是135下、146下、150下，为了使四次跳绳的平均成绩达到148下，第四次小华必须跳多少下？
<gadget id="calculator">148 * 4</gadget>
<output>592</output>

<gadget id="calculator">592 - 135 - 146 - 150</gadget>
<output>161</output>

<result>161</result>