A county harvested 5.2 million kilograms of vegetables last year, which is 3/10 more than this year. How many kilograms of vegetables were harvested this year?
某县去年收获蔬菜520万千克，比今年多(3/10)，今年收获蔬菜多少万千克？
<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 + (3/10)</gadget>
<output>13/10 = around 1.3</output>

<gadget id="calculator">520 / (13/10)</gadget>
<output>400</output>

<result>400</result>