Aunt Zhang bought 3 hamburgers and 5 cups of Coke from KFC, paying a total of 43.5 yuan. It is known that each hamburger is 7.5 yuan. How much is each cup of Coke?
张阿姨从肯德基买来3个汉堡和5杯杯可乐，共付43.5元，已知每个汉堡是7.5元，每杯可乐多少元？
<gadget id="calculator">7.5 * 3</gadget>
<output>22.5</output>

<gadget id="calculator">43.5 - 22.5</gadget>
<output>21</output>

<gadget id="calculator">21 / 5</gadget>
<output>21/5 = around 4.2</output>

<result>21/5 = around 4.2</result>