There was a strange boy who was born before his father. How can this be possible?

Two friends were betting. One said to the other, "The coin will be flipped twenty times and each time the coin lands on the head, I will give you $2 and each time it lands on the tale, you will give me $3." After flipping the coin twenty times not a single penny was exchanged among them.

How many times did the coin land on heads?

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.

You see me once in June, twice in November, and not at all in May. What am I?

Can you divide numbers from 1 to 9 (1 2 3 4 5 6 7 8 9) into two groups so that the sum of the numbers of each group is equal?

Note: 9 cannot be turned over to make it 6.

A famous swimmer can swim downstream in a lake in exactly 40 minutes with the lake current.
He can swim upstream in that lake in exactly 60 minutes against the lake current.
The length of the lake is 2 km.

How long he can cover the distance of one side at a still lake with no current?

2, 3, 5, 9, 17, _ What is the next number in the sequence?

What's the best place to go shopping in the ocean?

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?