The kindergarten teacher distributes some apples to the children. If each person distributes 1 apple, then there will be 18 more apples; if each person distributes 3 apples, then 12 apples will be lost. So how many children are there in the kindergarten?
幼儿园老师把一些苹果分给小朋友，如果每人分1个，则多18个苹果；如果每人分3个，则少12个苹果．那么幼儿园一共有多少个小朋友．
<gadget id="calculator">18 + 12</gadget>
<output>30</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

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

<result>15</result>