A soccer ball costs 60 yuan and a basketball costs 15 yuan. Mr. Wang bought back 25 footballs and basketballs, which cost 825 yuan. How many basketballs did Mr. Wang buy back?
一个足球60元，一个篮球15元，王老师买回足球和篮球共25个，用去825元．王老师买回多少个篮球？
<gadget id="calculator">60 * 25</gadget>
<output>1_500</output>

<gadget id="calculator">1_500 - 825</gadget>
<output>675</output>

<gadget id="calculator">60 - 15</gadget>
<output>45</output>

<gadget id="calculator">675 / 45</gadget>
<output>15</output>

<result>15</result>