Ben's Pig Pens

Riddle: You have seven pens and nine pigs. You must arrange the pens so that each pen has an even number of pigs. Zero is not allowed, nor will it work. How do you do this?

Answer: Stack the pens.

Source: https://www.riddles.com/index.php/7703

You have seven pens and nine pigs. You must arrange the pens so that each pen has an even number of pigs. Zero is not allowed, nor will it work. How do you do this? — Ben's Pig Pens by CoderGirl248 v1.

Riddle: You have seven pens and nine pigs. You must arrange the pens so that each pen has an even number of pigs. Zero is not allowed, nor will it work. How do you do this? Answer: Stack the pens. — by CoderGirl248 v2.