What is always in front of you but can’t be seen?

What does this rebus riddle means ?

If a wheel has 54 spokes, how many spaces are there between the spokes?

What is black when you buy it, red when you use it, and gray when you throw it away?

In the given figure, move three matchsticks so that the resulting figure contains two rectangles.

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

Find the next number in the series?
2, 12, 36, 80, 150, 252, 392, _ ?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

A Car driver was heading down a street in Washington. 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 right side of the road past a cop car. Still, he didn't break any traffic laws. Why not?