What is black when you buy it, red when you use it, and gray when you throw it away?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What 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?

I look at you, you look at me I raise my right, you raise your left. What am I?

Here is a mathematical expression that also secretly tells a movie name. What movie is that?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Analyze and find the missing item in the sequence:
16, 06, 68, 88, __, 98

A and B have a certain number of chocolates with them. If B gives one chocolate to A, they will have an equal number of chocolates. But if A gives one chocolate to B, then A will be left with half the number of chocolates that B has.

Can you find out the number of chocolates they have right now?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

John can place six large boxes or nine small boxes into a carton.

Can you find out in how many cartons can he place sixty-six boxes in total?