That attorney is my brother, testified the accountant.

But the attorney testified he didn't have a brother.

Who is lying?

Given that

(78)^9 = 6
And (69)^4 = 11

Can you find out

(99)^2 =?

(Note: This is Logical, not Mathematical)

What mathematical symbol can be put between 5 and 9, to get a number bigger than 5 and smaller than 9?

Name a key which is hardest to turn.

Pronounced as 1 letter, And written with 3, 2 letters there are, and 2 only in me. I’m double, I’m single, I’m black blue and grey, I’m read from both ends, and the same either way. What am I?

Can you fill the blank with the correct number?

6 30 870 756030 _____

What are the 50th, 63rd and 100th numbers in the sequence below?
4, 5, 8, 8, 9, 9, 12, 13, 13, 13, 17, 18, ...

If,

6 / 7 = 2
3 / 9 = 7
8 / 2 = 6

Then

4 / 5 = ?

Find the missing number in the image below.

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