A fruit shop has 5 boxes of apples of equal mass. If 12 kilograms are taken from each box, the total mass of apples remaining in the 5 boxes is exactly equal to the mass of the apples in the original 2 boxes. How many kilograms of apples are contained in each box?
水果店有5箱质量相等的苹果，如果从每个箱子中取出12千克，那么5个箱子中剩下苹果的总质量恰好等于原来2个箱子苹果的质量，原来每个箱子装多少千克苹果？
<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">12 * (5/3)</gadget>
<output>20</output>

<result>20</result>