The amount P of population varies directly with the population N of people. City A has a population of 416,000 and produces 260,000 tons of pollutants. Find how many tons of pollution we should expect City B to produce, if we know that its population is 350,000. (Show all work and do not round until the final answer. Then round to the nearest ton as needed)

Hi Theresa,

Direct variation means the ratio is a constant. So, you have

P/N = constant

260,000/416,000 = P/350,000

Solve for P,

P = 218,750 tons of pollutants

Hope it helps you!