Move four matchsticks to the below square to form three squares?

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

Solve the counting riddle by identifying the number of triangles in the given picture.

Find the next number in the sequence

5 12 24 36 ?

What does this below rebus puzzle mean?

Solve the equation in the image by looking at the pattern closely.

In a certain country ½ of 5 = 3. If the same proportion holds, what is the value of 1/3 of 10?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

I can be cracked, made, told, and played. What am I?

You need to remove four matchsticks from the picture below and still need to maintain the following as in the original image.
1. 1st row contains 12 matchsticks
2. 2nd row contains 12 matchsticks
3. 1st column contains 12 matchsticks
4. 2nd column contains 12 matchsticks