What is in seasons, seconds, centuries and minutes but not in decades, years or days?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

How many times can you subtract the number two from the number fifty?

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 ?

If 1+9+8=1, what is 2+8+9?

Can you find the thief by just looking at the picture below?

Which tank will fill first?

What do you get if you add 2 to 100 four times?

I travel all around the world but always stay in the corner. What am I?

A gardener planted the Lemon trees in a mathematical ordered way (i.e. he planted a tree in rows).
He created a total of 19 rows of trees.

Note: There should be more than 2 trees to count as a row.

What is the minimum number of trees required by the gardener to have 19 rows of trees?