Answer-At present, A is thrice as old as B. C is 5 years elder than B. The sum of the ages of A, B, C is 75...

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Let Bs age be x.  Then, As age  3x, and Cs age  x  5.  Given 3x  x  x  5  75  5x  5  75  5x  70   x14  As age  3  14  42 yrs  Bs age  14 yrs  Cs age  14  5  19 yrs  Five years ago, Bs age  14  5  9   Three years from now, As age  42  3  45   Required ratio  945  1 5

At present, A is thrice as old as
B. C is 5 years elder than
B. The sum of the ages of A, B, C is 75 years. The ratio of the age of B five years ago to the age of A three years from now is:

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At present, A is thrice as old asB. C is 5 years elder thanB. The sum of the ages of A, B, C is 75 years. The ratio of the age of B five years ago to the age of A three years from now is: