The school holds a rope skipping competition. There are 4 classes in the third grade. Each class selects 29 students to participate. There are 68 boys participating. How many girls are participating?
学校举行跳绳比赛，三年级有4个班，每班选29人参赛，参赛的男生有68人，参赛的女生有多少人？
<gadget id="calculator">29 * 4</gadget>
<output>116</output>

<gadget id="calculator">116 - 68</gadget>
<output>48</output>

<result>48</result>