Tickets for the China Pavilion in Shanghai are divided into ordinary tickets and preferential tickets. Regular tickets cost 20 yuan each, and Mr. Wang bought 67 discounted tickets for 1,005 yuan. How much is each discounted ticket cheaper than regular tickets?
上海中国馆门票分为普通票和优惠票．普通票票价为每张20元，王老师用1005元买了67张优惠票，每张优惠票比普通票便宜多少元？
<gadget id="calculator">1_005 / 67</gadget>
<output>15</output>

<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<result>5</result>