Brass is an alloy of copper and zinc, in which the copper content is 68%. A piece of brass contains 16 kilograms of zinc, how many kilograms of copper is contained in this piece of brass?
黄铜是铜和锌的合金，其中铜的含量是68%．一块黄铜里含锌16千克，这块黄铜中含铜多少千克？
<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">16 / (8/25)</gadget>
<output>50</output>

<gadget id="calculator">50 - 16</gadget>
<output>34</output>

<result>34</result>