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

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

what does this picture(rebus) riddle means ?

There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

How many sides does a circle have?

You are provided with a grid (as shown in the picture). Can you fill the squares with numbers 1-8 in a manner that none of the two consecutive numbers are placed next to each other in any direction (vertically, horizontally or diagonally?)

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

Which is the smallest number that you can write using all the vowels exactly once?

Nine marbles are arranged in the image below. Can you slide two marbles to form a square?