A plane crashed between the border of Mexico and America. Where do you bury the survivors?

I am not a bull but I have horns.
I am not an ass but I have a pack saddle.
Wherever I go, I leave silver behind me.

Who am I?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

What is next number in the pattern below:

131 517 192 123 ?

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

One night, a man runs away from home. He turns left and keeps running. After some time he turns left again and keeps running. Later, he turns left one more time and runs back home—but when he gets home, he finds a man in a mask. Who was the man in the mask?

Find the hidden tiger in the given optical illusion ?

I have teeth but i don't bite. Who Am I ?

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?