Present ages of father and son are in th...

Present ages of father and son are in the ratio of 5:1 respectively. Seven years later this ratio becomes 3:1. What is the son's present age in years ?

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The correct Answer is:

Suppose the present age of son be x years
Therefore, the present age of father would be 5x years
According to question,
`(5x+7)/(x+7)=(3)/(1)`
`implies5x+7=3x+21`
`implies5x-3x=21-7`
`implies2x=14`
`:.xx=7`

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