Question

The population of a city a which is 68000 decreases at the rate of 1200/year. Population of city b which is 42000, increases at the rate of 800 per year. Find in how many years, the population of cities a and b are equal?

Answer 1

Answer:

Given

Population of city = 68000

decrease rate of 1200/year

increase rate of 800 per year

find the how many years the population of cities a and b are equal

let assume no of years are x

then

=> 68000-1200 × x

=> 42000+800 × x

2000× x = 26000

=> x= 26000/2000

x=13

Population of cities a and b are equal =13 years

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@GauravSaxena01