A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

No matter how little or how much you use me, you change me every month. What am I?

Below, you can see three complete equations and one incomplete. Based on the three complete ones, can you complete the incomplete one?

5 $ 4 $ 3 $ 9 = 4215
6 $ 9 $ 2 $ 6 = 3816
4 $ 7 $ 3 $ 3 = 1122
7 $ 2 $ 7 $ 4 = ____

Can you discover the missing number in this series?

37, 10, 82
29, 11, 47
96, 15, 87
42, ?, 15

My location can be determined by the below rebus.
So where am i ?

What has a ring but no finger?

You can see three almost identical images below. Can you spot the odd one out from them?

Find the missing number in the series below

13 -21 34 -55 ? -144

What will be the best approach to finding all the prime numbers less than 75 that leave an odd reminder when we divide them with 5?