Question

A city has a population of 350000 the population has decreased by 30% in the past ten years what was the population of the city 10 years ago

Answer 1

500 000

Explanation:

the current population is 350 000, and it is given that this is 30% less than it was a decade ago. 30% less can be represented as (100-30)%=70% of the original population. letting the original population be x, we have the equation:

`0.7x=350000` (note that to convert % to decimal we divide by 100, in this case 70 becomes 0.7)

next, we can multiply both sides by 10.

`7x=3500000`.

finally, divide both sides by 7.

`\therefore x=500 000` is the original population.

Answer 2

500,000

Explanation:

The population of the city 10 years ago before the 30% decrease in population was 500,000.