Xiaogang has 30 stamps, Xiaojun has 10 stamps less than Xiaogang's 4 times, and Xiaojun has more stamps than Xiaogang.
小刚有30张邮票，小军的张数比小刚的4倍少10张，小军比小刚多多少张．
<gadget id="calculator">30 * 4</gadget>
<output>120</output>

<gadget id="calculator">120 - 10 - 30</gadget>
<output>80</output>

<result>80</result>