Brass is an alloy of copper and zinc, in which the copper content is 68%. A piece of brass contains 32 kilograms of zinc. How much does this piece of brass weigh? (solution by equation)
黄铜是铜和锌和合金，其中铜的含量是68%．一块黄铜里含锌32千克，这块黄铜重多少千克？(用方程解)
<gadget id="calculator">68 / 100</gadget>
<output>17/25 = around 0.68</output>

<gadget id="calculator">1 - (17/25)</gadget>
<output>8/25 = around 0.32</output>

<gadget id="calculator">32 / (8/25)</gadget>
<output>100</output>

<result>100</result>