There are 45 students in Class 1, and the number of boys accounts for 8/15 of the total number of students. If there are 30 students in this class to participate in the summer camp, what is the minimum number of boys?
六1班共有学生45人，男生人数占总人数的(8/15)，如果此班有30人参加夏令营，其中最少有多少名男生参加．
<gadget id="calculator">8 / 15</gadget>
<output>8/15 = around 0.533333</output>

<gadget id="calculator">1 - (8/15)</gadget>
<output>7/15 = around 0.466667</output>

<gadget id="calculator">45 * (7/15)</gadget>
<output>21</output>

<gadget id="calculator">30 - 21</gadget>
<output>9</output>

<result>9</result>