There are 120 people in the third grade, and the number of the third grade is the fourth grade (3/4). How many people are there in the third and fourth grades?
三年级有120人，三年级人数是四年级的(3/4)，三、四年级有多少人？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">120 / (3/4)</gadget>
<output>160</output>

<gadget id="calculator">160 + 120</gadget>
<output>280</output>

<result>280</result>