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2015-02-01T15:50:35+05:30
Let the present age be as x...
 
EQUATION :

(x + 15) = 4 * ( x -15  )
x + 15 = 4x - 60
x - 4x = -60 - 15
-3x = - 75
x = 75/3
= 25 yrs
 SO, his present age is 25 yrs..
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2015-02-01T15:53:50+05:30
Let the present age be x
a/q x+15=4(x-15)
⇒x+15=4x-60
⇒-3x=-75
⇒x=25
so his present age is 25
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