Hi  

Let s represent the son's age and G the Granpa's age

Question States***

G = 2s  |NOW

&

G-25 = 3(s-25) |25 years ago...

2s - 25 = 3s - 75

50 = s  |son's age NOW

G = 2s = 100

Granpa is 100 NOW

CHECKING our answer***

25 years ago...

75 = 3*25  Checks

Wish You the Best in your Studies.

 

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