People put me on the table and cut me but do not eat me. What am I?

Find The Next Number in this series.
1, 2, 6, 42, 1806 ?

A man dies of old age on his 25 birthday. How is this possible?

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?

A pond had 60 fish, out of which, all but 20 died.
How many fishes are now present in that pond?

A train leaves from point A for point B at 80 mph. After half an hour, another train leaves from point B for point A at 60 mph.

Which of the trains will be farther from point A when they meet ?

I am a number I am not an odd number I am higher than 90 I am not higher than 100 If you subtract me from 100, you get nothing. What number am I?

What does below Rebus mean ?

esgg sgeg gegs gsge

John went to buy some expensive, foreign chocolates. He only had Rs 100 with him. When he reached the shop, he got out and know that on those chocolates, there was a 15% import duty and 5% VAT.

How much worth chocolate should he buy so that he can accommodate it in Rs 100?

Take away the whole and some still remain. What is it?