wire uses 16 meters for the first time, 15% of it is used for the second time, and 40% of the wire is used for the second time. How many meters is the wire originally?
一根电线第一次用去16米，第二次用去它的15%，两次一共用去这根电线的40%，这根电线原来是多少米．
<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">15 / 100</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">(2/5) - (3/20)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">16 / (1/4)</gadget>
<output>64</output>

<result>64</result>