Xiaoyue bought a pen with half of the money she brought, and bought a box of yogurt for 2.5 yuan. At this time, there was 15 yuan left. How much money did Xiaoyue bring?
小悦用自己所带钱的一半买了一枝钢笔，又花2.5元买了一盒酸奶，这时还剩15元．小悦原来带了多少钱？
<gadget id="calculator">2.5 + 15</gadget>
<output>17.5</output>

<gadget id="calculator">17.5 * 2</gadget>
<output>35</output>

<result>35</result>