To process a cuboid iron sheet oil tank with a length of 5 decimeters, a width of 2 decimeters, and a height of 3 decimeters, how many square meters of iron sheet should be used at least?
加工一个长5分米，宽2分米，高3分米的长方体铁皮油箱，至少要用多少平方米铁皮？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">10 + 15 + 6</gadget>
<output>31</output>

<gadget id="calculator">2 / 100</gadget>
<output>1/50 = around 0.02</output>

<gadget id="calculator">31 * (1/50)</gadget>
<output>31/50 = around 0.62</output>

<result>31/50 = around 0.62</result>