How many triangles can you find in this given picture?

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

which number am I?

Name a key which is hardest to turn.

Take away the whole and some still remain. What is it?

When I get multiplied by any number, the sum of the figures in the product is always me. What am I?

Which country gets ill every time?

My first is in chocolate but not in ham. My second is in cake and also in jam. My third at tea time is easily found. Altogether, this is a friend who is often around. What is it?

Decode below rebus
D
N
A
T
S , D

What is both possible and impossible at the same time?

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?