Only one color, but not one size,
Stuck at the bottom, yet easily flies.
Present in sun, but not in rain,
Doing no harm, and feeling no pain.
What is it?

Find a 9-digit number, which you will gradually round off starting with units, then tenth, hundred etc., until you get to the last numeral, which you do not round off. The rounding alternates (up, down, up ...). After rounding off 8 times, the final number is 500000000. The original number is commensurable by 6 and 7, all the numbers from 1 to 9 are used, and after rounding four times the sum of the not-rounded numerals equals 24.

Can you identify the direction in which this bus is moving; left or right?

Hint: The bus is moving on the roads of London.

What work can one never finish?

An octopus has 8 legs. A hippogriff has 6 legs and 2 pairs of wings. A sphinx has 6 legs and one pair of wings. Now we have all 3 kinds and a total of 18 insects in a cage. We have a total of 118 legs and 20 pairs of wings. How many insects do we have of each kind?

How many times in a given day, minutes and hour clock comes in a straight line ?

What is black when you buy it, red when you use it, and gray when you throw it away?

How do you go from 98 to 720 using just one letter?

Complete the following series. It.s very logical:

1, 4, 5, 6, 7, 9, 11, __?

Can you make a fire with just a single stick?