Can you solve the tricky chess rebus puzzle below by ciphering the hidden meaning?

When you say goodbye, I am what you need to tie.
I come as a couple and go wherever you run.
Who am I?

Can you solve this tricky maths equation problem by replacing it? mark with the correct symbol?

19834 -----: 187
15921 -----: 153
17561 -----: 139
13734 -----: ???

There was an aeroplane crash, every single person died, but two people survived. How is this possible?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

A dying old man wants to divide his entire land between his only two sons. Since his only wish is to treat them as equal as both of them have been too good to him, he wants to divide his land equally between them. The problem is that the land is significantly irregular in shape and thus there is no choice of cutting them into two equal halves.

Can you help him divide the land in a manner that both of his sons will be happy?

What do you see in the given picture?

Can you write down eight eights so that they add up to one thousand?

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

On her drawing table, Sayna lit 12 coloured candles. A few seconds later she blew two candles off.

How many candles Sayna have at the end?