It is known that Mr. Zhang distributes 60 biscuits, 38 candies and 15 apples to each child in the first group equally, the remaining biscuits are 4 times the number of remaining apples, and the remaining sugar is 3 times the number of remaining apples , How many children are there in the first group?
已知张老师把60块饼干、38块糖和15个苹果平均分给第一小组的每位小朋友，余下的饼干是余下的苹果数的4倍，余下的糖是余下的苹果数的3倍，第一小组一共有几位小朋友？
<gadget id="calculator">15 * 3</gadget>
<output>45</output>

<gadget id="calculator">45 - 38</gadget>
<output>7</output>

<result>7</result>