Can you find the next number in the below sequence
3 , 7 , 10 , 11 , 12 , 17 ?

What goes through cities and fields, but never moves?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

A chicken farmer has figured out that a hen and a half can lay an egg and a half in a day and a half. How many hens does the farmer need to produce one dozen eggs in six days?

A maths symbol is hidden in the below Bar Graph. Can you decipher it?

Can you find the least possible number such that

If the number is divided by 3, it gives the remainder of 1;
If the number is divided by 4, it gives the remainder of 2;
If the number is divided by 5, it gives the remainder of 3;
If the number is divided by 6, it gives the remainder of 4.

Three people enter a room and have a green or blue hat placed on their heads. They cannot see their own hat but can see the other hats.
The colour of each hat is purely random. They could all be green, blue, or any combination of green and blue.
They need to guess their own hat colour by writing it on a piece of paper, or they can write 'pass'.
They cannot communicate with each other in any way once the game starts. But they can have a strategy meeting before the game.
If at least one of them guesses correctly they win $10,000 each, but if anyone guesses incorrectly they all get nothing.
What is the best strategy?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

Imagine you are in a room with no windows or doors. How will you get out?