My aunt bought 5 hamburgers and 5 pieces of fried chicken legs from McDonald's, and paid a total of 57.5 yuan. It is known that each hamburger is 8.5 yuan. How much is each piece of fried chicken legs? (solution by equation)
阿姨从麦当劳买来5个汉堡和5块炸鸡腿，共付出57.5元，已知每个汉堡是8.5元，每块炸鸡腿是多少元？(用方程解)
<gadget id="calculator">5 * 8.5</gadget>
<output>42.5</output>

<gadget id="calculator">57.5 - 42.5</gadget>
<output>15</output>

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<result>3</result>