Five vests of the same size can be cut from a length of 4 meters of fabric. How much cloth does it take to make a vest?
用一段长4米的布料可以裁5件同样大小的背心．做一件背心要用多少布？
<gadget id="calculator">4 / 5</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>