How do you go from 98 to 720 using just one letter?

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

There is a bag which have 21 blue balls and 23 red balls. You also have 22 red balls outside the bag. Randomly remove two balls from the bag. * If they are of different colors, put the blue one back in the bag. * If they are the same colour, take them out and put a red ball back in the bag. Repeat this until only one ball remains in the bag. What is the color of the sole ball left in the bag ?

How many letters are in the alphabet?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

Can you count the number of children in the picture below

What goes through cities and fields, but never moves?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

There is something which is always coming but never arrives?

You are in a room with no metal objects except for two iron rods. Only one of them is a magnet.
How can you identify which one is a magnet?