Q: If the ratio of Rohan's age 4 years ago to Rahul's age after 4 years is 1:1, and the present ratio of their ages is 5:3, determine the ratio between Rohan's age 4 years in the future and Rahul's age 4 years in the past.

A 1:3
B 3:1
C 4:3
D 3:4
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Answer: B


 If the ratio of Rohan's age 4 years ago and Rahul's age after 4 years is 1:1,
 and the present ratio of their ages is 5:3, the equation can be represented as:
(5x-4)/(3x+4)=1/1

Solving this equation gives us x=4, 
which means that the ratio between Rohan's age 4 years 
in the future and Rahul's age 4 years in the past is 
(5x+4):(3x-4) = 24:8 = 3:1.

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