Xiao Ming spent 17.50 yuan on the book and 8.50 yuan on the pen, leaving 27.20 yuan. How much money did Xiao Ming have?
小明买书用了17.50元，买钢笔用了8.50元，还剩下27.20元．小明原来有多少钱？
<gadget id="calculator">17.5 + 8.5 + 27.2</gadget>
<output>53.2</output>

<result>53.2</result>