If (1/2)x+5=30, then 4x-100=how much.
如果(1/2)x+5=30，那么4x-100=多少．
<gadget id="calculator">30 - 5</gadget>
<output>25</output>

<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">25 / (1/2)</gadget>
<output>50</output>

<gadget id="calculator">4 * 50</gadget>
<output>200</output>

<gadget id="calculator">200 - 100</gadget>
<output>100</output>

<result>100</result>