When can we add 2 to 11 and get 1 as the correct answer?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

Whats the next number in the below number sequence pattern.

A research team went to a village somewhere between the jungles of Africa. Luckily for them, they reached the day when quite an interesting custom was to be performed. The custom was performed once a year as they confirmed and was performed in order to collect the taxes from every male of the region.

The taxes were to be paid in the form of grains. Everyone must pay pounds of grain equaling his respective age. This means a 20-year-old will have to pay 20 pounds of grain and a 30-year-old will pay 30 pounds of grain and so on.

The chief who collects the tax has 7 weights and a large 2-pan scale to weigh. But there is another custom that the chief can weigh only three of the seven weights.

Can you find out the weights of the seven weights? Also, what is the maximum age of the man that can be weighed for the payment of taxes?

There is a place where if I stand up straight, I will still be considered sideways.

If 21x = 79x, what is the value of x?

What is full of holes but still holds water?

Readers with the eyes of a hunter can find the snake in the field. Can you? Test your puzzle-solving skills now!

Kids with the most attentive eyes can spot a different watermelon in 4 seconds. Can you? Test your eyes now!

What country can make you shiver?