Roses are 5 yuan per branch, and lilies are 9 yuan per branch. Aunt Wang bought two roses and some lilies for a total of 55 yuan. How many lilies did she buy?
玫瑰花每枝5元，百合花每枝9元，王阿姨买了两枝玫瑰和一些百合，共花了55元．她买了几枝百合？
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">55 - 10</gadget>
<output>45</output>

<gadget id="calculator">45 / 9</gadget>
<output>5</output>

<result>5</result>