When you buy me I am black in color. When you use me I am red and when you discard me I am grey in color. Who am I?

Three people check into a hotel. They pay $30 to the manager and go to their room. The manager finds out that the room rate is $25 and gives the bellboy $5 to return to the guests. On the way to the room the bellboy reasons that $5 would be difficult to split among three people so he pockets $2 and gives $1 to each person. Now each person paid $10 and got back $1. So they paid $9 each, totaling $27. The bellboy has another $2, adding up to $29.
Where is the remaining dollar?

A tunnel is 650m long. How far can a horse run into the tunnel if the horse is running at a speed of 10km/hr?

What occurs once in every minute, twice in every moment, yet never in a thousand years?

How many two cent stamps are there in a dozen?

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