Question

highland has a population of 12,200. Its population been increasing at a rate of 300 poeple per year. Lowville has a population of 21,000 and is declining by 250 people per year. Assuming the rates don't change, in how many years will the populations be equal

Answer 1

• 16 years

Explanation:

Equation for the Highland population

• 12200 + 300x

Equation for the Lowville population

• 21000 -250x

Populations are equal after

• 12200 + 300x = 21000 - 250x
• 300x + 250x = 21000 - 12200
• 550x = 8800
• x = 8800/550
• x = 16 years