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Hahahaha, Aaala!
Kafi sochna para, is tarha ho ga mere khyaal se;
140 Saal teenoN ki mila k banti hay;
Pota: 7Years
Baap: 49Years
Dada: 84Years 7+49+84 = 140 (Theek)
Pota kitnay Month ka = 7 x 12 = 84 => Dada ki umer in years (Theek)
Pota kitnay Din ka = 7 x 365 = 2555din => Baap ki umer in weeks [ (49x365) / 7 ] = 2555 (Ye be Theek)
D=S+20 (Dad is 20 years older than Son)
D+10 = 2xS (In ten years Dad will be twice Son's current age)
therefore (by substitution):
S+20+10 = 2xS
S+30 = 2S
2S = S+30
2S-S = 30 (subtract S from both sides) S = 30 (Son's current age) *answer*
D = S+20
D = 30+20 D = 50 (Dad's current age) *answer*
In ten years, Dad will be 60, which is twice Son's current age of 30.
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