One day, a hungry monster goes to a fast food restaurant to buy hamburgers and Coke. A hamburger is 15 yuan, and a cup of Coke is 5 yuan. Because the big eater bought a lot, the manager of the restaurant gave him a discount, 10% off for hamburgers, 20% off for Coke. After doing the math, he could pay 14% less in total. It is known that the big eater drank 10 cups of Coke, so how many burgers did the big eater eat?
一天饥饿的大食怪去快餐店买汉堡和可乐，汉堡一个15元，可乐一杯5元．由于大食怪买的多，餐厅经理给他打折，汉堡打9折，可乐打8折，他一算，一共可以少付14%的钱．已知大食怪喝了10杯可乐，那么大食怪吃了多少个汉堡．
<gadget id="calculator">86 / 100</gadget>
<output>43/50 = around 0.86</output>

<gadget id="calculator">50 * (43/50)</gadget>
<output>43</output>

<gadget id="calculator">43 - 40</gadget>
<output>3</output>

<gadget id="calculator">15 * (43/50)</gadget>
<output>129/10 = around 12.9</output>

<gadget id="calculator">13.5 - (129/10)</gadget>
<output>0.6</output>

<gadget id="calculator">3 / 0.6</gadget>
<output>5</output>

<result>5</result>