The number of long distance phone calls between two cities during a certain period varies jointly as the populations of the cities, p 1 and p 2 , and inversely as the distance between them, in miles If 80,000 calls are made between two cities 400 mi apart, with populations of 70,000 and 100,000, ho...

Lets denote the number of calls as C the population of city 1 as p1 the population of city 2 as p2 a ...

The number of long-distance phone calls between two cities during a certain period varies jointly as the

Question:

The number of long-distance phone calls between two cities during a certain period varies jointly as the populations of the cities, p₁ and p₂, and inversely as the distance between them, in miles. If 80,000 calls are made between two cities 400 mi apart, with populations of 70,000 and 100,000, how many calls (to the nearest hundred) are made between cities with populations of 50,000 and 75,000 that are 250 mi apart?

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