The ratio between the present ages of X and Y is 2 : 3. After 4 years, X's age will be 20 years. What is the age of Y at present?
Let the present ages of X and Y be 2x and 3x respectively.
Then, 2x+4 = 20
=> x = 16/2 = 8
.'. Y's present age = 3x = 3*8 = 24 years.
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