An oil drum, the bottom of which is a square with a side length of 3 decimeters and a height of 3.2 decimeters. Pour such a barrel of oil into a bottle with a capacity of 720 ml, how many bottles can be filled?
一种油桶，底面是边长为3分米的正方形，高3.2分米．把这样一桶油倒入容积是720毫升的瓶子里，可以装多少瓶？
<gadget id="calculator">1_000 / 720</gadget>
<output>25/18 = around 1.388889</output>

<gadget id="calculator">3 * 3 * 3.2 * (25/18)</gadget>
<output>40</output>

<result>40</result>