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The product of Ramu's age (in years) fiv...

The product of Ramu's age (in years) five years ago with his age (in years) 9 years later is 15. Find Ramu's present age.

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let Ramu's present age be `x` year
according to the question
`(x-5)(x+9)=15`
`x^2+9x-5x-45-15=0`
...
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