How can you make the following equation true by drawing only one straight line: 5+5+5=550 ?

Can you solve the below algebraic mathematical equation?

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

What Deficiency does the below rebus represent?

VIT_MIN

Do you know who was buried in John's tomb?

There is a box full of marbles,
all but two are blue,
all but two are green,
and all but two are red.

How many marbles are in the box?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

You are trapped in a room with two doors. One leads to certain death and the other leads to freedom. You don't know which is which.
There are two robots guarding the doors. They will let you choose one door but upon doing so you must go through it.
You can, however, ask one robot one question. The problem is one robot always tells the truth, the other always lies and you don't know which is which.
What is the question you ask?

Can you find out which triangle will have a bigger area among the following?
1. A triangle with sides 300, 400 and 500
2. A triangle with sides 300, 400 and 700

The more it dries, the wetter it becomes. Can you tell what it is?

It has horns but can’t beep. It is like to bleat but It is not a sheep. What is it?