Liu Jia's average number of rope skipping three times is 93. If the average number of rope skipping after the fourth jump is 94, how many ropes does he have to jump for the fourth time?
刘佳三次跳绳的平均个数是93个，要想第四次跳绳后的平均个数为94个，那么他第四次要跳多少个？
<gadget id="calculator">94 * 4</gadget>
<output>376</output>

<gadget id="calculator">93 * 3</gadget>
<output>279</output>

<gadget id="calculator">376 - 279</gadget>
<output>97</output>

<result>97</result>