A fish pond is 52 meters long, and a pine tree is planted every 4 meters along the perimeter, and three flowers are planted between every two pine trees. How many flowers are planted around the fish pond?
一个鱼池周围长52米，沿周围每隔4米种一棵松树，每两棵松树间种三棵花，鱼池周围一共种了多少棵花．
<gadget id="calculator">52 / 4</gadget>
<output>13</output>

<gadget id="calculator">13 * 3</gadget>
<output>39</output>

<result>39</result>