After Xiao Ming welds a 30-decimeter long iron wire into a cube frame (not counting the joints), how many square decimeters of paper is needed to surround each side at least.
小明把一根长30分米的铁丝焊成一个正方体框架(接头处不计)后，最少需要用多少平方分米的纸才能把各面围起来．
<gadget id="calculator">30 / 12</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">(5/2) * (5/2) * 6</gadget>
<output>75/2 = around 37.5</output>

<result>75/2 = around 37.5</result>