In the activity class, 99 students were divided into 33 groups on average, among which there were 5 groups with only 1 boy, and 18 groups with 2 or 3 girls. There were as many groups with all boys as with all girls. How many boys are there in total?
在活动课上，99名学生平均分成33组，其中只有1名男生的共5个小组，有2名或3名女生的共18个小组，全部是男生和全部是女生的小组一样多，那么所有的男生共有多少人？
<gadget id="calculator">18 - 5</gadget>
<output>13</output>

<gadget id="calculator">33 - 13 - 13 - 5</gadget>
<output>2</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">99 / 33</gadget>
<output>3</output>

<gadget id="calculator">13 * 3</gadget>
<output>39</output>

<gadget id="calculator">1 * 5</gadget>
<output>5</output>

<gadget id="calculator">4 + 39 + 5</gadget>
<output>48</output>

<result>48</result>