They came out at night, without being called.
They lost at day, without being stolen.
Who are they?

A man has a barrel filled with oil that weighs 100 pounds, and then he puts something into it. Now the barrel weighs less than 100 pounds. What did he put in the barrel?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

Can you Find and name the hidden bird in the picture below ?

Four people need to cross a rickety bridge at night. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. The bridge is only strong enough to support two people at a time. Not all people take the same time to cross the bridge. Times for each person: 1 min, 2 mins, 7 mins and 10 mins. What is the shortest time needed for all four of them to cross the bridge?

Find three whole, positive numbers that have the same answer when multiplied together as when added together.

what's the probability of getting a king or a queen from a pack of 52 cards?

Can you replace the X (both small and big x) with the numbers between 1 to 19 such that all the rows of 3 numbers between X (big x) sum to 23?

Count the number of triangles in the below picture?