Math

If 3 salesmen can sell three cars in seven minutes, how many cars can six salesmen sell in seventy minutes?

related riddles

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

In an alien land far away, half of 10 is 6. If the same proportion holds true, then what is 1/6th of 30 in this alien land?

If you have three oranges and you take away two, how many will you have?