Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

A cricket has 6 legs, a squirrel has 4 legs and a spider has 8 legs.

In a local zoo, it was found that the total number of legs is 612. Also, there are equal number of each of the above animals/insects.

Can you find out how many animals are there in the zoo?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

I have holes on the top and bottom. I have holes on my left and on my right. And I have holes in the middle, yet I still hold water. What am I?

I have branches, but no fruit, trunk or leaves. What am I?

You need to pick one entry from pot A and one from pot B to have a perfect match. Can you do it?

If you drop me I’m sure to crack, but give me a smile and I’ll always smile back. What am I?

A sundial has the fewest moving parts of any timepiece. Which has the most?