If it took eight men ten hours to build a wall, how long would it take four men to build it?

If 21x = 79x, what is the value of x?

There’s a girl who has a large family. She has an equal amount of brothers and sisters, but each brother only has half as many brothers and sisters. What’s the correct amount of brothers and sisters?

Using exactly three matchsticks, can you divide the area into two equal parts?

Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

Jenifer is learning to drive her car. She went down a one way lane and in the wrong direction. But she do not break any law.

How come ?

My location can be determined by the below rebus.
So where am i ?

Can you quickly find which two matchstick figures are identical?

Solve this logical number series puzzle by replacing the question mark with the correct number
9090 = 4
1234 = 0
6055 = 2
9081 = 4
8888 = ?

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes