[IMAGE: https://cdn.steemitimages.com/DQmeDJESRkKQe1fCReU1sbdoNApyXk9td56Y5AaKNGcCkrW/image.png]

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?

[IMAGE: 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?