The mother duck led her child to learn to swim in the pond. She was afraid of losing her child, so she counted while swimming, counting from back to front until she was the 6th, and from front to back until she was the 7th, then the duck How many children does the mother have in total?
鸭妈妈领着自己的孩子在池塘里学游泳，她怕丢失了孩子，一边游一边数着，从后往前数到自己是第6个，从前向后数到自己是第7个，那么鸭妈妈一共有多少个孩子．
<gadget id="calculator">7 - 2</gadget>
<output>5</output>

<gadget id="calculator">6 + 5</gadget>
<output>11</output>

<result>11</result>