Xiaohong, Xiaohua and Xiaoming each collected 50 stamps on average, Xiaohong collected 46, Xiaohua collected 50, how many stamps did Xiaoming collect
小红、小华和小明平均每人收集了50张邮票，小红收集了46张，小华收集了50张，小明收集的邮票张数是多少张
<gadget id="calculator">50 * 3</gadget>
<output>150</output>

<gadget id="calculator">150 - 46 - 50</gadget>
<output>54</output>

<result>54</result>