There are 5 boxes with the same number of pencil boxes. If 60 pencil boxes are taken from each box, the sum of the number of pencil boxes left in the 5 boxes is equal to the sum of the numbers in the original 2 boxes. How many pencil cases are there in each box?
5个箱里放着同样个数的铅笔盒，如果从每个箱里拿出60个，那么5个箱里剩下铅笔盒的个数的总和等于原来2个箱里个数的和．原来每个箱里有多少个铅笔盒？
<gadget id="calculator">60 * 5</gadget>
<output>300</output>

<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">300 / 3</gadget>
<output>100</output>

<result>100</result>