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

Find the next number in the sequence

1, 2, 6, 21, 88, __?

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?

Forwards I am heavy, backward I am not. What am I?

How many times can you subtract the number two from the number fifty?

A girl says this to her best friend: “I was born in 1955, and I celebrated my 17th birthday last weekend.” Her best friend thinks she’s lying, but she’s actually correct. How is that possible?

The square root of number 121 is "11". What is the square root of the number "12345678987654321."?

It is deaf, Dumb and Blind!!!

Still, always tells the truth. What is it?

A professor thinks of two consecutive numbers between 1 and 10.
'A' knows the 1st number and 'B' knows the second number

A: I do not know your number.
B: Nor do I know your number.
A: Now I know.

What are the four solutions for this?

You can see three almost identical images below. Can you spot the odd one out from them?