20 pears and 16 apples are placed in two piles, with a total weight of 11 kg. If 4 pears and 4 apples are exchanged from the two piles, the weight of the two piles will be the same. How many kilograms does each apple weigh than a pear?
20个鸭梨和16个苹果分放两堆，共重11千克，如果从两堆中分别取4个鸭梨和4个苹果相交换，两堆重量就相同了．每个苹果比鸭梨重多少千克．
<gadget id="calculator">20 + 24</gadget>
<output>44</output>

<gadget id="calculator">11 / 44</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">12 / 8</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(1/4) * (3/2)</gadget>
<output>3/8 = around 0.375</output>

<gadget id="calculator">(3/8) - (1/4)</gadget>
<output>1/8 = around 0.125</output>

<result>1/8 = around 0.125</result>