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4 Village X has a population of 68000, which is decreasing at the rate of 1200 per year. Village Y has a population of 42000, which is increasing at the rate of 800 per year. In how many years will the population of the two villages be equal?
A. 16
B. 22
C. 13
D. 7
See Answer & Explanation Lets Discuss
Correct answer is : C
Explanation

Let the population of villages X and Y becomes equal after n years.

Then, 68000 - 1200n = 42000 + 800n

=> 2000n = 26000

=> n=13.

So, their population will be equal after 13 years.

 

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