Xiao Hua, Xiao Ming and Xiao Qiang shared some exercise books, Xiao Hua brought 8 books, Xiao Ming brought 7 books, Xiao Qiang did not bring exercise books, he paid 10 yuan, how much money should Xiao Hua deserve?
小华、小明和小强三人合用一些练习本，小华带来8本，小明带来7本，小强没有带练习本，他付出了10元，小华应得几元钱？
<gadget id="calculator">8 + 7</gadget>
<output>15</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">8 - 5</gadget>
<output>3</output>

<gadget id="calculator">10 / 5</gadget>
<output>2</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>