Village X has a population of 68000, which is decreasing at the rate of 1200 lation of 42000, which is increasing at the rate of 800 per year. In how man the two villages be equal?
Answer
Answer (as printed):
Explanation
Let the population of villages X and Y be equal after p years. Then, 68000 – 1200p = 42000 + 800p ⇒ 2000p = 26000 ⇒ p = 13. So, their population will be equal after 13 years.
Explanation as extracted from the printed page; notation may be imperfect.