Xiaohong brought 200 yuan and bought some roses for 2.5 yuan each, and bought a vase of 50 yuan, and got back 12.5 yuan. How many roses did Xiaohong buy?
小红带了200元钱买了一些2.5元一支的玫瑰，又买了一个50元的花瓶，还找回12.5元，小红买了多少支玫瑰？
<gadget id="calculator">200 - 12.5 - 50</gadget>
<output>137.5</output>

<gadget id="calculator">137.5 / 2.5</gadget>
<output>55</output>

<result>55</result>