Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

Your job is to measure 45 minutes if you have only two cords and matches to light the cords.

1. The two cords are twisted from various materials, so their different segments can burn at different rates.
2. Each cord burns from end to end in exactly one hour.

Describe your way of measuring the 45 minutes.

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

When my father was 31 I was 8. Now he is twice as old as me. How old am I?

Using four sevens (7) and a one (1) create the number 100. Except for the five numerals, you can use the usual mathematical operations (+, -, x, :), root and brackets ()

Move three sticks of the spiral below to form a square.

What does below chemistry rebus means?

What is harder to catch the faster you run?

What does this Rebus Picture means ?

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?