Which country gets ill every time?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

O_er_t_o_

Complete the missing letters of the given word.

I have thought of a number that is made up by using all the ten digits just once. Here are a few clues for you to guess my number:

First digits is divisible by 1.
First two digits are divisible by 2.
First three digits are divisible by 3.
First four digits are divisible by 4.
First five digits are divisible by 5.
First six digits are divisible by 6.
First seven digits are divisible by 7.
First eight digits are divisible by 8.
First nine digits are divisible by 9.
The number is divisible by 10.

Can you find out the number ?

What type of tree can I carry in my hand?

Solve the following series:
AZ, GT, MN, __, YB

The answer I give is yes, but what I mean is no. What was the question?

Before Mount Everest was discovered, what was the highest mountain in the world?

The centre of the third figure is empty. What digit should fit inside?

Three playing cards in a row. Can you name them with these clues? There is a two to the right of a king. A diamond will be found to the left of a spade. An ace is to the left of a heart. A heart is to the left of a spade. Now, identify all three cards.