Question
P is 7 years older than her sister. Her sister is 25
years younger than her friend. If the ratio between the ages of P and her sister’s friend is 3:5, then what will be the age of P’s sister after 3 years?ÂSolution
Let the age of P = x and her sister’s age = x - 7 Sister’s friend age = (x – 7) + 25 = x + 18 Ratio between the ages of P and her sister’s friend is 3:5. => x/(x+18) = 3/5 => 5x = 3x + 54 => 2x = 54 => x = 27 P’s sister age = 27 – 7 = 20 After 3 years P’s sister age = 20 + 3 = 23 years Â
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