If you’ve ever tried to carry someone piggyback, you know it’s hard work. Now imagine that friend standing on your shoulders, with 8 other people stacked above both of you! Every year in Spain, people come together to see who can stack up to make the tallest tower, or “castell” — without anyone falling. Some people have made castells 10 people-layers high!

*Wee ones:* If a tower has 6 layers of people stacked, what number layer is next?

*Little kids:* If you stack a green-shirt person, then blue, then green, then blue, then green, does the tower have more green shirts or blue shirts? *Bonus:* If they stack 9 layers and you’re in the very middle layer, in which layer are you?

*Big kids:* If you’re in a 14-layer tower, and there are 3 more layers below you than above you, in which layer are you? *Bonus:* If everyone in a 10-layer tower is 5 1/2 feet tall, how high is the top of the tippy-top person’s head?

__Answers:__

*Wee ones:* The 7th layer.

*Little kids:* More green shirts. *Bonus:* The 5^{th} layer.

*Big kids:* 5 above you and 8 below, so you’re the 9th layer. You need 2 numbers 3 apart that add to 13 (all the layers minus your own). *Bonus:* 55 feet.