There are 120 boys in Guangming Primary School. If the number of girls increases by 20%, there will be the same number of boys. How many students are there in the third grade?
光明小学有男生120人，女生人数增加20%就与男生人数一样多，三年级学生共有多少人．
<gadget id="calculator">20 / 100</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">120 / (6/5)</gadget>
<output>100</output>

<gadget id="calculator">100 + 120</gadget>
<output>220</output>

<result>220</result>