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Let a, b & c be the ages of grandson, father & grandfather respectively. Given that sum of their ages is 100 years ⇒ a+b+c = 100 ... (1) Also, Age of grandson in months = Age of grandfather in years ⇒ a*12 = c ...(2) & age of grandson in days = Age of father in weeks ⇒a*365 = (b*365)/7 ⇒ 7a = b ...(3) substituting the values of b and c from (2) & (3) in equation (1), we get a+7a+12a = 100 ⇒20 a = 100 ⇒ a = 5( Age of granson = 5 years) therefore, b = 7a = 7*5 = 35 (Age of father = 35 years) & c = 12a = 12*5 = 60(Age of grandfather = 60 years)