Pour 7 liters of water into a cuboid container with a square bottom and a side length of 2 decimeters, and then put an egg in. After the egg is completely submerged in the water, measure the water depth at this time to be 18 cm. What is the volume of the egg? cubic decimeter?
向一个底面是正方形且边长是2分米的长方体容器里倒入7升水，再放入一枚鸡蛋，鸡蛋完全浸入水中后，量得这时的水深18厘米，这枚鸡蛋的体积是多少立方分米？
<gadget id="calculator">18 / 10</gadget>
<output>9/5 = around 1.8</output>

<gadget id="calculator">2 * 2 * (9/5)</gadget>
<output>36/5 = around 7.2</output>

<gadget id="calculator">(36/5) - 7</gadget>
<output>1/5 = around 0.2</output>

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