How do you go from 98 to 720 using just one letter?

What Deficiency does the below rebus represent?

VIT_MIN

If you were to put a coin into an empty bottle and then insert a cork into the neck, how could you remove the coin without taking out the cork or breaking the bottle?

John is the son of Jacob.
So,
Jacob is the_____of John's father?

It is a 5 letter word if you take away first letter it is something you get from sun, if you remove second letter you will get something to eat, if you remove third letter you get a word you use in pointing at and if you remove the fourth letter you get something to drink. What is it?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?

In my garden, I have many trees but only one of them is the mango tree. In these mango trees, there are some mangoes(as expected).

But after a strong wind, there are neither mangoes on the tree nor on the ground. Explain?

Jack have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the colour of the socks. How many of the socks did he want to take to match one pair

What does this rebus mean?

O
N
C
E
TIME

If six children and two dogs were under an umbrella, how come none of them got wet?