If the height of a triangle is increased by 25%, what is the base to keep the area of the triangle constant?
一个三角形的高增加25%，要使三角形的面积不变，底应多少．
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<result>1/5 = around 0.2</result>