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We can make out that the problem of pollution is extensive that it led to unbreathable air and a deadly haze and as per a study farm fire has been found to account for only 40% of pollution, hence both I and II are implicit assumptions, and correct answer is option 5.
Sum of the present ages of A, B, C and D is 60 years. After 2 years ratio of their ages is 7:5:3:2. What is C’s present age?