Question
P is 9 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 5:7, then what will be the age of P’s sister after 4 years? TYPE PSolution
Let the age of P = x and her sister’s age = x - 9 Sister’s friend age = (x – 9) + 25 = x + 16 Ratio between the ages of P and her sister’s friend is 5:7. => x/(x+16) = 5/7 => 7x = 5x + 80 => 2x = 80 => x = 40 P’s sister age = 40 – 9 = 31 After 4 years P’s sister age = 31 + 4 = 35 years
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