What four weights can be used to balance from 1 to 30 pounds?

It was a dark stormy night and a couple were in a car driving madly to a city. The car broke down and the husband had to go get help from someone who spoke his language. He was afraid to leave his wife alone in the car so he locked the car before leaving. When he came back, the car was in the same state as he had left it but his wife was dead, there was blood on the floor and there was a stranger in the car. What happened?

why number 8549176320 is one of a kind?

You need to remove two matchsticks to make the below equation true. Can you do it ?

You want to boil a two-minute egg. If you only have a three-minute timer (hourglass), a four-minute timer and a five-minute timer, how can you boil the egg for only two minutes?

Find three numbers such that When we multiply three numbers, we will get the prime numbers. The difference between the second and the first number is equal to the third and second.

Twenty frogs are sitting on a log floating on the surface of a river. Two of them decide to jump off into the water.

How many frogs are there on the log at this moment?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

What can you catch but never throw?

Below the four parts have been reorganised. The four partitions are exactly the same in both arrangements. Why is there a hole?