If we add four times the age of John four years from now to five times his age five years from now we get ten times his current age.

How old will John be two years from now?

Replace each alphabet with the number (1-9) to make the below equation correct.

AB * C = DE - F = GH / I

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

John is asked to stand behind Jacob and Jacob is asked to stand behind John. Both of them feel confused about it and don't know what to do?

But it is quite possible, do you know how?

Christina has four daughters, and each of her daughters has a brother. How many children does Christina have?

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

A chess tournament is taking place on knock-out terms (the one who loses the match is out of the game).
(a) If 10 matches are played in total, how many players participated?
(b) If 20 players took part in the tournament, how many matches were played?

Solve the puzzle by telling what does below picture means.

Can you count the number of blocks in the picture below?