((0.75)/(x))=((1.8)/(3.84)).
((0.75)/(x))=((1.8)/(3.84))．
<gadget id="calculator">0.75 * 3.84</gadget>
<output>2.88</output>

<gadget id="calculator">2.88 / 1.8</gadget>
<output>1.6</output>

<result>1.6</result>