Below toothpicks/matchsticks indicate the group of fishes moving from west to east direction. Can you make them move from east to west by just moving three toothpicks/matchsticks?

Why Aeroplane windows are round?

Solve the equation by replacing the alphabet with numbers.

MOM + MOM + NO = BOOK=

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.

Without looking at a calendar, within a minute name, a boy's name using 5 consecutive 1st letters of 5 consecutive months

What is the longest word in the dictionary?

Solve the following series:
AZ, GT, MN, __, YB

Different lights make me strange by changing me into different sizes. What am I?

Solve the counting riddle by identifying the number of triangles in the given picture.

Can you think of any three-dimensional shape that comprises of exactly two surfaces?