Teacher Ai Li bought 5 football tickets at a discounted price of 10% off, which cost 180 yuan in total. How much is the original price of each ticket?
艾利老师按九折优惠的价格购买了5张足球的门票，一共用去180元．每张门票的原价是多少元？
<gadget id="calculator">90 / 100</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">180 / (9/10) / 5</gadget>
<output>40</output>

<result>40</result>