After 6 kg of water is used in a bucket of water, the remaining 6 kg is more than what was used. How many kg does the bucket of water have?
一桶水用去6公斤后，剩下的比用去的还多6公斤，这桶水原有多少公斤．
<gadget id="calculator">6 + 6 + 6</gadget>
<output>18</output>

<result>18</result>