I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

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

which number am I?

Can you count the number of children in the picture below

A rubber ball keeps on bouncing back to 2/3 of the height from which it is dropped. Can you calculate the fraction of its original height that the ball will bounce after it is dropped and it has bounced four times without any hindrance ?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

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

The sum of a mother, her baby and her dog's weight is 170 Kg. How much does the baby weigh if the mother weighs 100 kg more than the combined weight of the baby and the dog, and the dog weighs 60 per cent less than the baby?

Find the next number in the sequence

5 12 24 36 ?

A little girl goes to the store and buys one dozen eggs. As she is going home, all but three break. How many eggs are left unbroken?

In the figure that has been attached to this question, each digit represents a digit. The similar letters carry the same integer value. Can you expose the original digits?