Can you name some countries which do not have the alphabet 'A' in them?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

What's the next in the series?

H, Be, F, S, Mn, Kr, In, Gd, Tl, ?

Twice ten are six of us,

Six are but three of us,

Nine are but four of us;

What can we possibly be?

Would you know more of us?

Twelve are but six of us,

Five are but four, do you see?

What are we?

A family is trapped in a jungle. There is a bridge which can lead them to safety. But at one time, the bridge can only allow two people to pass through. Also, all of them are afraid of the dark and thus, they can't go alone.

Father takes 1 minute to cross, the mother takes 2 minutes, the son takes 4 and the daughter takes 5 minutes. While crossing the time taken will be according to the slower one. How can they all reach the other side in the minimum possible time?

Can you count the number of squares in the given picture?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Count the squares in the matchstick puzzle below?

What is the word or phrase?

Can you find a pattern and the missing number in the series given below?

100, 155, 258,? , 584, 819.