Divide the (8/15) meter long iron wire into 4 sections on average, how much is each section shorter than the total length of the original iron wire
把(8/15)米长的铁丝平均分成4段，每段比原来铁丝总长短多少
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">(8/15) / 4</gadget>
<output>2/15 = around 0.133333</output>

<gadget id="calculator">(8/15) - (2/15)</gadget>
<output>2/5 = around 0.4</output>

<result>2/5 = around 0.4</result>