How can you make number one disappear by adding something to it?

There was a kingdom in which the king had no heir to take over his thrown. Even the queen was dead and he himself was on the verge of dying. He thought about it and then summoned all of the teenagers. He gave one seed each to all of them and asked them to grow the plant. He announced that the one with the most beautiful plant will become the king/queen of the empire after the death of the king.

After a month, all of them were called. The king looked at all of the plants but announced the girl with an empty pot as the queen of the empire. Why?

Why despite killing dozens of people Charley and Wilma were not punished?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Be active and find the killer in the picture Riddle below.

I am a seven-letter word but if you remove four of my letters I will have one left. What word am I?

Which digit occurred maximum times between the number 1 and 1000?

The average age of 10 members of a committee is the same as it was 4 years ago, because an old member has been replaced by a young member. Find how much younger is the new member ?

If all Goats are Sheep and all Sheep are Deers, are all Deers Goats ?

Find the next number in the series below

21 32 54 87 131 ?