When 30 students in a class go out for an outing, when they have a group lunch, the rule is: each person has a bowl of rice, every 2 people has a bowl of soup, and every 3 people has a bowl of vegetables. How many bowls will these students need to use in total?
某班30名学生外出郊游，集体午餐时，规定：每人一碗饭，每2人一碗汤，每3人一碗菜．这些学生一共需要使用多少个碗？
<gadget id="calculator">30 * 1</gadget>
<output>30</output>

<gadget id="calculator">30 / 2</gadget>
<output>15</output>

<gadget id="calculator">30 / 3</gadget>
<output>10</output>

<gadget id="calculator">30 + 15 + 10</gadget>
<output>55</output>

<result>55</result>