It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

Can you move 2 matchsticks to form four equal sized squares.

At my favorite fruit stand,
an orange costs 18,
a pineapple costs 27,
and a grape costs 15.
Using the same logic, can you tell how much a mango costs?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

What does the below rebus riddle means?

Spot the cat in the picture below

A mules travels the same distance daily.
I noticed that two of his legs travels 10km and the remaining two travels 12km.
Obviously two mules legs cannot be a 2km ahead of the other 2.

The mules is perfectly normal. So how come this be true ?

How far can you walk into the woods?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n