Question
What was the sum of the ages of the father and the
daughter 5 years earlier? A.  Ratio of the father’s present age to the daughter’s age after 5 years is 5 : 2. B. The difference between twice the present age of the father and five times the daughter‘s present age is 20 years. C. The ratio of the age of the father after 5 Years to tha age of the daughter after 6 years is 5: 2. The following questions are accompanied by three statement A, B and C. you have to determine which statement (s) is /are necessary/ sufficient to answer the question.Solution
Let the present ages of father and daughter be F and D years respectively. A. = 
 (5/2) 2F = 5D + 20 2F – 5 D = 20 B. 2 F – 5 D = 20 C. = ((F+5)/(D+6)) = (5/2) 2 F + 10 = 5 D + 30 2 F – 5 D = 20 Here, all the three equations are the same.
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