World's Hardest Riddles With Answers

74658

* 8 + 6 =14
* 5 = 4 + 1
* 7 = 2*4 - 1
* 4 + 6 = 10
* 7+4+6+5+8 = 30

The number that will come place in place of question mark is 0.

If you add the numbers in each diagonals, you will find that the sum is 25 every time.

1. Fill 5 litre jar ( 5j - 5, 3j - 0)
2. Transfer to 3 litre jar (5j - 2, 3j - 3)
3. Empty 3 litre jar ( 5j - 2, 3j - 0)
4. Transfer 2 litre from 5 litre jar to 3 litre jar (5j - 0, 3j - 2)
5. Fill 5 litre jar(5j - 5, 3j - 2)
6. Transfer 1 litre from 5 litre jar to 3 litre jars(5j - 4, 3j - 3)

The trick to solve this puzzle is to analyze the open cube. All the faces patter are given twice. In such case, whenever the cube is folded, you wont find any face repeated. Thus, the option D fits the criteria.

The highest number that can be formed is 811105. The first picture that you see in the answer tells you how to make 511108 by moving two matchsticks.

In this series, every single digits in in the middle of two prime number.

4 is in the middle of 3 and 5 which are prime.
6 is in the middle of 5 and 7 which are prime.

Thus, the numbers are 108 will be 138, 150 and 180.

3 blind mice {no i}

The statement is true only if both of the siblings live till the younger one is as old as the older one was when the younger was born.

He can purchase 19 new bottles in return.

He will get 15 bottles after returning 75 empty bottles and will be left 2 empty bottles.
Now, the 15 bottles when empty will get him 3 more bottles.
The three empty bottles will get him another bottle. Remember he had 2 empty bottles as well.

15
You can calculate it using old school way. However if you want to solve using logic, you can look below:
There is one piece of chocolate and we need exactly 2 x 8 = 16 pieces.
Whenever you break that bar, you will get one more piece. Thus, you will need to break it (16 - 1) = 15 times.