The area of the Yangtze River Basin accounts for about (1/5) of the total land area of my country, and the area of the Yellow River Basin accounts for about (2/25) of the total land area of my country. What percentage of the total land area of my country are the two basins?
长江流域面积约占我国陆地总面积的(1/5)，黄河流域面积约占我国陆地总面积的(2/25)，两条流域一共占我国陆地总面积的几分之几？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 25</gadget>
<output>2/25 = around 0.08</output>

<gadget id="calculator">(1/5) + (2/25)</gadget>
<output>7/25 = around 0.28</output>

<result>7/25 = around 0.28</result>