Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

81 x 9 = 801. What must you do to make the this equation true?

A newspaper is supposed to have 60 pages, but pages 24 and 41 are missing.
Which other pages won't be there?

In a science lab, a petri dish hosts a healthy colony of yeast for an experiment. Now every minute, all the yeast cells divide into two. At noon, there was just a single cell of yeast and at 1:22, the Petri dish was half full. Can you calculate when the dish will be full of yeast?

You are given with the following sum. Each of the letters can be decoded as a digit. If we tell you that D = 5, then can you solve it entirely?

DONALD
+GERALD
=ROBERT

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

When it's bad luck to meet a black cat?

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