There are two baskets of pears, of which the weight of the large basket is 28 kg. Take 4 kg from the large basket and put it into the small basket. At this time, the weight of the two baskets is the same.
有两筐梨，其中大筐梨重28千克，从大筐中拿出4千克放入小筐里，这时两筐梨同样重，小筐原来有梨多少千克？
<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">28 - 8</gadget>
<output>20</output>

<result>20</result>