A dictionary is priced at 13.5 yuan after a price reduction of 1.5 yuan. How much has the price been reduced?
一本字典，降价1.5元后，售价13.5元，降价了多少
<gadget id="calculator">13.5 + 1.5</gadget>
<output>15</output>

<gadget id="calculator">1.5 / 15</gadget>
<output>0.1</output>

<result>0.1</result>