smartick.com
To solve this problem, we have to remember that a century is 100 years, therefore 4 centuries are 4×100=400 years. Knowing this, we just have to add these 400 years to the year in which the bottle was made, 2009. Therefore 2009 + 400 = 2409. Answer: The bottle's lifespan will end in 2409. Problem 2. To solve this problem, we need to subtract ...