Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

What came first, the chicken or the egg?

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

During which month do people sleep the least?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

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?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

Can you identify if it's a murder or a suicide ?

You are given four results as below:
1111 = F
2222 = E
3333 = T
Then, can you find out how to code 4444?