Two boxes of apples, take out (1/4) from box A and (1/5) from box B. At this time, the weight of the remaining apples in the two boxes of apples is equal. How many kilograms are the original apples?
两箱苹果，从甲箱中取出(1/4)，从乙箱中取出(1/5)，这时两箱苹果剩下的苹果重量相等，已知甲箱原有苹果40千克，乙箱原有苹果多少千克？
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 - (1/5)</gadget>
<output>4/5 = around 0.8</output>

<gadget id="calculator">(3/4) / (4/5)</gadget>
<output>15/16 = around 0.9375</output>

<gadget id="calculator">40 * (15/16)</gadget>
<output>75/2 = around 37.5</output>

<result>75/2 = around 37.5</result>