The school held a sports meeting. There were 76 participants in the third grade, and the number of participants in the fourth grade was exactly twice that of the third grade. How many students in grades 3 and 4 are there?
学校举行运动会，三年级有76人参加，四年级参加的人数正好是三年级的2倍．三、四年级一共有多少人参加？
<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">76 * 3</gadget>
<output>228</output>

<result>228</result>