It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

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?

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

Can you find a number that lies one third of the distance between 1/3 and 2/3?

Can you find out the next digit in the following series ?

0, 0, 1, 3, 2, 6, 3, 9, 4, 12, 5, ?

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

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

Can you make four (4) nines (9) equal 100?

Take away the whole and some still remain. What is it?

what's the probability of getting a king or a queen from a pack of 52 cards?