The school organizes a mathematics competition. There are 42 students in the third grade, 10 less than the fourth grade. The number of fifth grade participants is twice that of the fourth grade. How many people in the fifth grade participate in the competition?
学校组织数学竞赛，三年级有42人参加，比四年级少10人，五年级参加的人数是四年级的2倍，五年级有多少人参加竞赛？
<gadget id="calculator">42 + 10</gadget>
<output>52</output>

<gadget id="calculator">52 * 2</gadget>
<output>104</output>

<result>104</result>