The students went to visit Baoying Museum. There were 54 students in the second grade, 20 more students in the third grade than in the second grade, twice as many students in the fourth grade as the total number of the second and third grades. How many people went to the fourth grade?
同学们去参观宝应博物馆，二年级去了54人，三年级去的人数比二年级多20人，四年级去的人数是二、三年级总人数的2倍，四年级去了多少人？
<gadget id="calculator">54 + 20 + 54</gadget>
<output>128</output>

<gadget id="calculator">128 * 2</gadget>
<output>256</output>

<result>256</result>