I have many puzzles here, try to solve them, i'll post a new one after someone gives the correct answer for the current puzzle, you can also post your puzzles here too!
P.S: if you want some hints, just post here, I have 3 hints for each question.

ok, here's my first puzzle!

A boy and his sister are sitting around the kitchen table.

"You know, Sis, if you took away 2 years from my age and gave them to you, you'd be twice my age!"

"Well, why don't you just give me one more on top of that? Then i'll be 3 times your age."

So, just how old is each sibling?

oh..this is so hard...

6 and 6

I know I know!
10!!!!!
are these from professor Layton?

It's ten, since none of the actual candles disappeared, right?

guys...your very good at this...
i really don't know about this kind of games...

but ES said the same answer as me...
anyway what's the next question!?

The answer to puzzle number 2 is, 3 candles remained because the 7 candles that remained lit melted.

Here's puzzle no. 3:

A tennis ball had rolled its way down into a hole. This particular hole is extremely deep and has a sharp bend in the middle, making the ball impossible to retrieve by hand. To make matters worse, the ground is made of hard clay, so digging the ball isn't an option.

However, you have something incredibly commonplace on hand that you can use to get the ball out. what do you use to get the ball out? Answer in five letters

here's a hint:

If you use this, the ball will float..

is it... water?

yeah..! the answer's water! way to go natt!

Here's puzzle number 4:

I bought it black, I used it red, and I threw it white

hint:
It is used for cooking, and it is 8 letters long.

can you give us another clue?

I know it's a stupid gyess but cockeral?