The school holds a sports meeting. The third grade has 48 participants, the fourth grade has 6 more participants than the third grade, and the fifth grade has three times the total number of participants in the third and fourth grades. How many fifth graders are participating?
学校举行运动会．三年级有48人参赛，四年级参赛的比三年级多6人，五年级的参赛人数是三、四年级参赛总人数的3倍．五年级有多少人参赛？
<gadget id="calculator">48 + 6 + 48</gadget>
<output>102</output>

<gadget id="calculator">102 * 3</gadget>
<output>306</output>

<result>306</result>