After the price of a sweater is reduced by 5 yuan, it is sold at 45 yuan, how much is the price reduced?
一件毛衣降价5元后，按45元售出，降价多少
<gadget id="calculator">45 + 5</gadget>
<output>50</output>

<gadget id="calculator">5 / 50</gadget>
<output>1/10 = around 0.1</output>

<result>1/10 = around 0.1</result>