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.

Below is the sum of symbols in each row and column in the figure. Analyzing the figure, can you find out the value of the symbols?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

What comes
Once in a Year
Twice in a Month
4 times in a Week
6 times in a Day

Can you calculate the probability of getting a sum of six when a dice is thrown twice?

I have no doors but I have keys, I have no rooms but I have space, you can enter but you can’t leave! What am I?

A new clothing store has a unique method of pricing items. A vest costs $20, a tie costs $15, a blouse costs $30, and underwear costs $45. How much would pants cost?

A wooden log balances equally on the scales when weighed with three-quarters of a pound and three-quarters of a wooden log.

Can you calculate the weight of the entire wooden log?

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?

Which letter of the alphabet has the most water?