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

What Deficiency does the below rebus represent?

VIT_MIN

What has many keys but can’t open a single lock?

John was running from 40 thieves. John has got 3 gold boxes which weigh as 4kg, 2kg, and 1kg respectively. A witty man asked John to stay with him for seven days in exchange for 1kg gold per day. John needs to stay there for seven days and also do not want to give the witty man any advance. How can John pay for his seven days stay?

If we tie a Sheep to one peg, a circled grass is been eaten by the Sheep. If we tie the Sheep to two pegs with a circle on its neck, then an eclipse is eaten out of the grass by the Sheep. If we want an eclipse then we put two pegs and then put a rope in between them and the other end of the rope is tied up on the Sheep's neck.

How should we tie the peg and the Sheep so that a square is eaten out from the garden grass? We only have one Sheep rope and the peg and the rings.

Your mother’s brother’s only brother-in-law is asleep on your couch. Who is asleep on your couch?

Cristina was born in 1888. She just had her 30th birthday today how did that happen?

If two's company, and three's a crowd, then whats four and five ?

Which statement is true out of the following?
One statement here is false.
Two statements here are false.
Three statements here are false.

What does this Rebus Picture mean?