(9/10) meters of iron wire weighs (3/10) kg, what is the length of 1 kg of iron wire in meters?
(9/10)米铁丝重(3/10)千克，1千克铁丝长多少米．
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">3 / 10</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(9/10) / (3/10)</gadget>
<output>3</output>

<result>3</result>