How would the cost per person change if the total cost remains the same (constant), but more and more people joined the group? Example: You buy $40 worth of pizza for yourself. Another friend joins you (for a total of two people) to share both the pizza and the cost, how much does it cost you now? What if there are 4 of you eating $40 worth of pizza? What if there are 5 of you? What if there are 8 of you?
Look up 'Inverse Variation'. Post what you find out. NO COPYING AND PASTING!! Best answer gets a prize.