A swimming pool is 50 meters long and 10 meters longer than it is wide. How many square tiles with a side length of 4 decimeters are needed to stick on the bottom of the pool?
一个游泳池长50米，比宽长10米．在池底贴上边长为4分米的正方形瓷砖，共需多少块？
<gadget id="calculator">4 * 4</gadget>
<output>16</output>

<gadget id="calculator">10 / 16</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">50 * 10 * 10 * (5/8)</gadget>
<output>3_125</output>

<result>3_125</result>