1.5 yuan per bottle of mineral water, a total of 135 yuan spent. Just three bottles per person. How many students are there in total?
每瓶矿泉水1.5元，总共花了135元．正好每人分三瓶．一共有多少个同学？
<gadget id="calculator">135 / 1.5 / 3</gadget>
<output>30</output>

<result>30</result>