Hope Primary School has 240 graduates this year, an increase of 20% compared to last year. How many students graduated last year?
希望小学今年有毕业生240人，比去年毕业的增加20%，去年毕业的学生有多少人？
<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">240 / (6/5)</gadget>
<output>200</output>

<result>200</result>