A basket of pears weighs 25 kilograms. Take out half of the pears and weigh them. The weight is 15 kilograms. How many kilograms of pears are there in the basket?
一筐梨连筐重25千克，取出梨的一半后再称，重15千克，这个筐里原来装了多少千克梨．
<gadget id="calculator">25 - 15</gadget>
<output>10</output>

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<result>20</result>