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Alvin is now 20 years older than his son.In 10 years,he will be twice as old as his son's age.What are their present age's?

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Christine,
(D=Dad's age, and S=Son's age)

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.

Please ask for -Gort.















Posted on Aug 27, 2010

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Sam is 5 years old...his older brother Tom is 3 times as old as Sam...when Sam is 20...how old will Tom be?


Well, Tom is 3 x 5 = 15 yrs now. Sam has 15 yrs to go to 20. Then Tom will be 15 + 5 = 30 yrs.

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The sum of ages of marian, diana and carlos are 17. Two years from now marian will twice as old as diana. if carlos is half as old as marian four years from now. How ald are they now ? Pls show the...


Let m be Marian's age, d Diana's age and c Carlos age.
  • sum of ages is 17: m+d+c=17
  • two years from now Marian will be twice as old as Diana: m+2=2*(d+2) so m+2=2d+4 so 2d=m-2 or d=(m-2)/2=m/2-1
  • Carlos will be half as old as Marian 4 years from now: c+4=1/2(m+4) or c+4=m/2+2 or c=m/2-2
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Mary who is sixteen years old is four times as old as her brother.How old will mary be when his twice as old as her old brother?


Let the brother's age be x:
16years for Mary = 4x years for Brother

From equation: 4x = 16
x = 4
Therefore, the brother is 4 years old.

Mary Brother
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After 4 years + 4 4
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After the next 4 years + 4 4
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24 is twice as old as 12; therefore for the sister to be twice as old as brother she will 24years when her brother is 12 years.

Or by calculation;

If 4 is the age for the brother, when the sister is 16, and y years will pass for the to be such that the sister is twice as old as the brother, then;

16 + y = 2(4 + y)
16 + y = 8 + 2y
16 - 8 = 2y - y
8 = y
Therefore, 8 years elapse before the sister is twice as old as the brother.

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Brother will be: (4 + 8) = 12years

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Ek dada,ek baap,ek pota,tino ka age 140 years.pota jitne month ka dada utne saal ka,pota jitne din ka baap utne week ka,tino ka age kya hoga?


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)

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Jasmin is twice as old as rodney nine years ago


Hi,

Let the present age of the Rodney = X
present Age of the Jasmin = Y

As per the Situation,

Y-9 = 2 (X - 9)
Y-9 = 2X - 18
Y = 2X - 18 +9
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Taking Both the situations,

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Hence,

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Let me know, if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

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