Can you solve the below algebraic mathematical equation?

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

If you remove one from eleven, it becomes ten. If you remove one from nine, it becomes ten.

How is this possible?

How can you write nineteen in a manner that if we take out one, it becomes twenty?

I inserted a coin in a bottle and closed its mouth with the help of a cork. Now, I was able to take the coin out from the bottle without taking out the cork or breaking the bottle. Can you tell me how I did it?

Find the Next Number in the Sequence

2 9 3 1 8 4 3 6 5 7 ?

If 21x = 79x, what is the value of x?

Two in a corner, one in a room, zero in a house, but one in a shelter. What is it?

A man desired to get into his work building, however he had forgotten his code.
However, he did recollect five pieces of information
* Fifth number + Third number = 14
* The fourth number is one more than the second number.
* The first number is one less than twice the second number.
* The second number and the third number equals 10.
* The sum of all five numbers is 30.

What is the code ?

Solve below popular number sequence
314 159 265 358 979 323 846 ?

John is selling fruits.
He sells grapes at $30, Dates $25, and a Wolfberry $45.
At what price does he sell fig?

PS: Logical Thinking