Can you convert the number zero(0) into a positive number using just one mathematical operator ?

Find the 8 in the below-given Image.

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?

I have eight fingers and two thumbs but I do not live. What Am I?

On a magical land of Mexico , all the animal in the land are rational.

There are 10 tigers and one goat.
Tiger can eat goat but since it's a magical land , the tiger who eats the goat , turns into goat and then can be eaten by the remaining tiger(s).

If we leave them for some time then how many goat and tiger will be there , when we come back ?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

Can you guess the name of the month by looking the below rebus ?

I can write cow in 13 letters.

Can You?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

I am sure no one can have two things for dinner. what are they?