There are 5 boxes of balls in a store. If 15 balls are taken out from each box, the number of balls remaining in the 5 boxes is exactly equal to the number of balls in the original two boxes. How many balls are in each box?
某商店有5箱皮球，如果从每箱里取出15个，那么5个箱子剩下皮球的个数正好等于原来两箱皮球的个数，原来每箱装了多少个皮球？
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">5 / 3</gadget>
<output>5/3 = around 1.666667</output>

<gadget id="calculator">15 * (5/3)</gadget>
<output>25</output>

<result>25</result>