Find The Next Number In The Sequence

30 10 15 13 0 16 -15 ?

What has 88 keys?

Use only one mathematical symbol and all numbers (0-9) to get a sum of 99

Using mathematical symbols like +, -, and x in order to make the equations correct. Replace # with the above-given symbols.

9 # 8 # 7 # 6 # 5 # 4 = 91

Teacher ask the student

'Why are you standing on that chair in music class ?'.

what did student replied ?

The king of Octopuses has servants who have six, seven or eight legs. The distinguishing characteristics of the servants is that the one with seven legs always lie but the one with either six or eight legs speak the truth always.

One day, four servants meet and converse:

The black one says, 'We have 28 legs altogether.'

The green one says, 'We have 27 legs altogether.'

The yellow one says, 'We have 26 legs altogether.'

The red one says, 'We have 25 legs altogether.'


Can you identify the colour of the servant who is speaking the truth?

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

There is one thing that goes round the house and also inside the house but never even share a brief touch. What is it?

If eleven plus two equals one, what does nine plus five equal?

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.