((2.5)/(1.6))=((0.75)/(x)).
((2.5)/(1.6))=((0.75)/(x))．
<gadget id="calculator">0.75 * 1.6</gadget>
<output>1.2</output>

<gadget id="calculator">1.2 / 2.5</gadget>
<output>0.48</output>

<result>0.48</result>