Question
The sum of the ages of C and D after 10 years will be
100 years. If the ratio of their present ages is 9:7, find the difference between their ages.Solution
Let the present ages of C and D be 9x and 7x years.
Sum of their present ages = 100 - 20 = 80 years
ATQ,
(9x + 7x) = 80
16x = 80
So, x = 5
Difference between their present ages = (9x - 7x) = 2x = 10 years
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