SOLUTION: The water usage in a city varies directly with the population of a city. City A has a population of 325,000 people and uses an average of 28,925,000 gallons of water per day. How

Algebra ->  Finance -> SOLUTION: The water usage in a city varies directly with the population of a city. City A has a population of 325,000 people and uses an average of 28,925,000 gallons of water per day. How      Log On


   



Question 1087249: The water usage in a city varies directly with the population of a city. City A has a population of 325,000 people and uses an average of 28,925,000 gallons of water per day. How many gallons of water per day should we expect City B to produce if its population is 4,890,00.
Answer by ankor@dixie-net.com(22740) About Me  (Show Source):
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The water usage in a city varies directly with the population of a city.
City A has a population of 325,000 people and uses an average of 28,925,000 gallons of water per day.
How many gallons of water per day should we expect City B to produce if its population is 4,890,000.
:
Direct variation ratio
:
let b = gal of water used by City B
b%2F28925000 = 4890000%2F325000
we can simplify this
b%2F28925000 = 4890%2F325
cross multiply
325b = 28925000*4890
325b = 1.414(10^11)
b = 1.414%2810%5E11%29%2F325
b = 435,210,000 gal used by city B