cuboid glass fish tank without a cover is 6 decimeters long, 2.5 decimeters wide, and 4 decimeters high. How many square meters of glass is at least needed to make such a rain jar?
一个无盖长方体玻璃鱼缸的长6分米，宽2.5分米，高4分米．制造这样的一个雨缸至少要玻璃多少平方米？
<gadget id="calculator">6 * 2.5</gadget>
<output>15</output>

<gadget id="calculator">6 * 4 * 2</gadget>
<output>48</output>

<gadget id="calculator">4 * 2.5 * 2</gadget>
<output>20</output>

<gadget id="calculator">15 + 48 + 20</gadget>
<output>83</output>

<gadget id="calculator">83 / 100</gadget>
<output>83/100 = around 0.83</output>

<result>83/100 = around 0.83</result>