2 ducks playing,
when 3 ducks came?
how many ducks on the river?
2 ducks over the hill crossing,
1 duck fall, 2 have been rescued.
how many ducks on the hill?
![](https://steemitimages.com/640x0/https://cdn.steemitimages.com/DQmWoEKSzcE1W1QTtazAwfu3iofzxPPwJH5DU5wpRqScfEF/image.png)
I have a pen,
I have 2 pens,
I have 3 pens when I jump, all pen are scattered.
how many pens I have?