4: (2/3)=((Χ)/25).
4：(2/3)=((Χ)/25)．
<gadget id="calculator">4 * 25</gadget>
<output>100</output>

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

<gadget id="calculator">100 / (2/3)</gadget>
<output>150</output>

<result>150</result>