The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

What has hands, but can’t clap?

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

I’m tall when I’m young, and I’m short when I’m old. What am I?

81 x 9 = 801. What must you do to make the this equation true?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

I am thinking of a five-digit number such that:
The first and last digits are the same, their submission is an even number and multiplication is an odd number and is equal to the fourth number. Subtract five from it and we obtain the second number. Then divide into exact halves and we get the 3rd number.

What number I am thinking of?

Count the number of squares in the picture below.

How high do you have to count before you use the letter “a” in the English spelling of the whole number?

You have a thousand Re. 1 coins with you. You have ten bags with you and you can put any number of coins in each of the bags. The condition is that if someone asks you for any amount between 1 and 1000, you must be able to give that amount by just giving the bag (you are not allowed to open the bag and give coins).

How will you do it?