There is a square of a particular number which when doubled, becomes 7 more than its quarter.

Can you find the number?

Can you solve the below algebraic mathematical equation?

(J+O+I+N+T)3 = JOINT

What number comes next in this sequence:
7 8 5 5 3 4 4 _

A man hijacks an aeroplane transporting both passengers(8 of them) and valuable cargo. After taking the cargo, the man demands nine parachutes, puts one of them on, and jumps, leaving the other eight behind. Why did he want eight?

John speaks the truth only once a day in a week. Below are a few hints for you:

First: Days are Sunday, Monday and so on.
Second: One day he says, "I lie on Monday and Tuesday".
Third: On the next day, he says, "Today is either Thursday, Saturday or Sunday".
Fourth: On the next day, he says, "I lie on Wednesday and Friday".

Can you identify the day on which he speaks the truth?

A man dies of old age on his 25 birthday. How is this possible?

Two batsman each on 94 runs. Seven runs needed to win in last 3 balls. Both make 100*. How?

A prisoner is told: "If you tell a lie, we will hang you and if you tell the truth, we will shoot you." What did the prisoner say to save himself?

In the attached figure, you can see a chessboard and two rooks placed on the chess board. What you have to find is the number of squares that do not contain the rooks. How many are there?

Solve this riddle by finding the odd one out from the rest.