I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

Move four matchsticks to the below square to form three squares?

Two old friends, Jack and Bill, meet after a long time.

Three kids
Jack: Hey, how are you, man?
Bill: Not bad, got married and I have three kids now.
Jack: That's awesome. How old are they?
Bill: The product of their ages is 72 and the sum of their ages is the same as your birth date.
Jack: Cool..But I still don't know.
Bill: My eldest kid just started taking piano lessons.
Jack: Oh, now I get it.

How old are Bill's kids?

What numbers should go on the bottom line?
3 6 9 15
8 2 10 12
11 8 19 27
19 10 29 39
? ? ? ?

What number comes next in the series?

5 15 5 18 5 24 14 20 _

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Can you find the company name in the pictogram below?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

It is always ahead of me yet I can never see it. What is it?