bucket of paint with buckets weighs 25 kilograms. After half of the paint is used, the buckets still weigh 13 kilograms. How many kilograms does the bucket weigh?
一桶油漆连桶共重25千克，用去一半油漆后，连桶还重13千克，桶重多少千克．
<gadget id="calculator">25 - 13</gadget>
<output>12</output>

<gadget id="calculator">12 * 2</gadget>
<output>24</output>

<gadget id="calculator">25 - 24</gadget>
<output>1</output>

<result>1</result>