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Five years ago the ratio of Krishna’s age to his father’s age was 1:4 and five years from now their ages will be in the ratio 2:5 What is the ratio of their present ages ?
  • a)
    1:2
  • b)
    1:3
  • c)
    3:1
  • d)
    2:1
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Five years ago the ratio of Krishna’s age to his father’s ...
The ratio of ages of Krishna and his father 5 years ago was = 1:4
So, let their ages be x and 4x
Five years later their ages are x+10: 4x + 10
But that is in the ratio of 2 : 5
So, 5x + 50 = 8x + 20
So, x = 10
Their ages now = 15:45 = 1:3
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Most Upvoted Answer
Five years ago the ratio of Krishna’s age to his father’s ...
To Ravi's ages was 3:2.

Let Krishna's age 5 years ago be 3x and Ravi's age 5 years ago be 2x.

Now, after 5 years, Krishna's age will be (3x + 5) and Ravi's age will be (2x + 5).

The ratio of their ages after 5 years will still be 3:2.

So, we have the equation (3x + 5)/(2x + 5) = 3/2.

Cross multiplying, we get 2(3x + 5) = 3(2x + 5).

Expanding, we get 6x + 10 = 6x + 15.

Subtracting 6x from both sides, we get 10 = 15.

This is not possible, so there is no solution.

Therefore, there is an error in the given information or question.
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Five years ago the ratio of Krishna’s age to his father’s age was 1:4 and five years from now their ages will be in the ratio 2:5 What is the ratio of their present ages ?a)1:2b)1:3c)3:1d)2:1Correct answer is option 'B'. Can you explain this answer?
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