Xiao Ming went to the stationery store to buy school supplies. He bought a ballpoint pen for 6.9 yuan, and bought 2 copies of "Xinhua Dictionary" for 13 yuan. He took 25 yuan with him. How much money can he get back?
小明到文具店购买学习和品，买了支圆珠笔用去6.9元，买2本《新华字典》用去13元，他带去25元，还可找回多少元？
<gadget id="calculator">6.9 + 13</gadget>
<output>19.9</output>

<gadget id="calculator">25 - 19.9</gadget>
<output>5.1</output>

<result>5.1</result>