Why is the Hole below a Lock?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Three brothers Jacob, John, and James live in Mexico City. The product of the ages of these brothers is 175. Jacob and John are twins. How old is James?

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

Prove that twice of ten is the same as twice of eleven.

Below, you will find the mathematical proof that 10 equals 9.99999?. But is that possible or there is something wrong about it? Can you find the error?

x = 9.999999...
10x = 99.999999...
10x - x = 90
9x = 90
x = 10

Which country gets ill every time?

The world's largest Thanksgiving turkey was on display at a fair. Everyone was admiring it when suddenly a woman ran up and shot the turkey and left. Everyone knew her yet nobody made any attempts to stop or report her. Why?

What is black when you buy it, red when you use it, and gray when you throw it away?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?