Xiaohong, Xiaohua and Xiaogang each have some Olympic Fuba. After Xiaohong gave Xiaohua 3 and Xiaohua gave Xiaogang 5, the three people had the same number of Fuwa. How many more did Xiaohua have than Xiaogang? ．
小红、小华和小刚各有一些奥运小福娃，小红给小华3个，小华给小刚5个后，三个人的福娃个数同样多，小华原来比小刚多多少个．
<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<result>7</result>