Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

What am I?

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

Can you find the missing letter in the sequence?
S - T - I - L - ? - T - F - Y - C

Can you solve the rebus below?

John is on an island and there are three crates of fruit that have washed up in front of him. One crate contains only apples. One crate contains only oranges. The other crate contains both apples and oranges.

Each crate is labelled. One reads 'apples', one reads 'oranges', and one reads 'apples and oranges'. He know that NONE of the crates have been labeled correctly - they are all wrong.

If he can only take out and look at just one of the pieces of fruit from just one of the crates, how can he label all of the crates correctly?

Can you circle exactly four of these numbers such that the total is twelve?

1 6 1
6 1 6
1 6 1
6 1 6

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

Replace the question mark with the correct number.