Among the students who participated in the Mathematical Olympiad in a certain school last year, girls accounted for 1/4 of the total. This year, the number of students participating in the school increased by 20%, and girls accounted for 1/3 of the total. How much has the number increased.
去年某校参加数学奥林匹克竞赛的学生中，女生占总数的(1/4)，今年全校参赛的学生增加了20%，女生占总数的(1/3)，与去年相比，今年参赛的女生人数增加了多少．
<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">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(6/5) * (1/3)</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 * (1/4)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">(2/5) - (1/4)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(3/20) / (1/4)</gadget>
<output>3/5 = around 0.6</output>

<result>3/5 = around 0.6</result>