In a bronze ware, the mass of copper is (1/5) kg, accounting for (2/3) of the total mass of the bronze ware, and the total mass of the bronze ware is (3/5) the mass of an iron sword, which is What is the mass of the iron sword in kilograms?
一件青铜器中，铜的质量是(1/5)千克，占这件青铜器总质量的(2/3)，而这件青铜器的总质量是一把铁剑质量的(3/5)，这把铁剑的质量是多少千克？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(1/5) / (2/3) / (3/5)</gadget>
<output>1/2 = around 0.5</output>

<result>1/2 = around 0.5</result>