A flower shop can make a profit of 2 yuan by selling a lily, and can make a profit of 1.5 yuan by selling a rose. The flower shop sells 13 lilies and several roses on a certain day, and the total profit is 50 yuan. How many roses are sold.
某花店卖出一枝百合花可获利2元，卖出一枝玫瑰花可获利1.5元，该花店某天卖出百合花13枝和玫瑰花若干枝，共获利50元，则当天卖出玫瑰花多少枝．
<gadget id="calculator">2 * 13</gadget>
<output>26</output>

<gadget id="calculator">50 - 26</gadget>
<output>24</output>

<gadget id="calculator">24 / 1.5</gadget>
<output>16</output>

<result>16</result>