What does the below rebus riddle means?

How is the moon similar to a dollar?

Can you count the number of triangles in the given figure?

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

What is the coolest letter in the alphabet?

A bus driver was heading down a street in Mexico. He went right past a stop sign without stopping, he turned left where there was a "no left turn" sign, and he went the wrong way on a one-way street. Then he went on the left side of the road past a cop car. Still - he didn't break any traffic laws. Why not?

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?