21. hitesh is 40 years old and ronnie is 60 years old. How many years ago was the ratio of their ages 3:5 ?
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Answer: if the ratio of their ages was 3:5 'x' years ago then
(40-x)/(60-x) = 3/5
By cross-multiplying,
200 - 5x = 180 - 3x
After solving the equation we get ,
x = 10
Therefore the ratio of ages of hitesh and ronnie was 3:5 10 years ago
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