On the ground of an equilateral triangle, place vases every 10 meters. There are 75 vases in total. Find the side length of the triangle.
在一个等边三角形的地上，每隔10米放上花瓶，共放了75个花瓶，求三角形的边长．
<gadget id="calculator">75 / 3</gadget>
<output>25</output>

<gadget id="calculator">10 * 25</gadget>
<output>250</output>

<result>250</result>