You need to arrange three 7 and mathematical symbols to form number 1?

What month of the year has 28 days?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Can you write down eight eights so that they add up to one thousand?

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

The chance of Mr John winning the lottery is 10%. All participants lined up and Mr John is 4th in the row. The first three participants lose the lottery.

What is the chance of Mr John now?

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

Look at the below sequence of letters and tell us what the next letter should be:

O T T F F S S ?

I am a five-letter word under you,
Remove the first letter and I am above you,
Remove the second as well and I am around you.

Who am I?

What word does this rebus represent?

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