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The ratio of current age of X and Y is 5:7,after hw many years der age ratio will b 7:9?

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Posted on Jan 02, 2017

CreativeTECH
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SOURCE: The average age of 3

The average is 20, it means the total is 60. The sum of ratio is 15 (3+5+7)
Therefore the age of a girl is calculated by multiplying the respective ration with total and dividing by sum of ratio
Age of Eldest girl = 7 x 60 /15 = 28

Hope it helps! Good Luck!
CreativeTECH

Posted on Feb 15, 2011

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How old is a 10 year old dog in human years


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Adjoa is three years older than her brother Kwame.seven years ago,the sum of their ages 13years.calculate the sum of their present ages.


Let Adjoa's age be x and Kwame's y.
  • Adjoa is 3 years older than Kwame: x=y+3
  • Seven years ago sum of their ages was 13: (x-7)+(y-7)=13
  • Now you substitute first equation into second equation: (y+3-7)+(y-7)=13
  • 2y-4-7=13
  • 2y=24
  • y=24/2=12 years
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Tom is 5 times as old as todd.In seven years Tom's age will be 6 years more than 3 times as old as Todd. How old is Todd


Todd is 4 years old.

Let Tom's age = X
Let Todd's age = Y

From the given facts:

X = 5Y

and

X + 7 + 6 = 3 ( Y + 7 )
X+13 = 3Y + 21
X = 3Y + 8

So if:
X=5Y
and
X=3Y+8

Then:
5Y=3Y+8
2Y=8
Y=4

I hope that helps.

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The average age of 3 girls is 20 years and their ages are in the ratio 3:5:7.The age of the eldest girl is:


The average is 20, it means the total is 60. The sum of ratio is 15 (3+5+7)
Therefore the age of a girl is calculated by multiplying the respective ration with total and dividing by sum of ratio
Age of Eldest girl = 7 x 60 /15 = 28

Hope it helps! Good Luck!
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1 Answer

Reasoning question: if RED is coded as 6720 then how GREEN is coded as?


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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)

Concerned, Nooh bin Sikander

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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?


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.















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1 Answer

Cindy is 5 years older than Alex and 7 years older than peter sum


Three unknowns with three equasions:
cindy is 5 years older than alex. write it as c = a + 5
cindy is 7 years older than peter. write it as c = p + 7
The sum of their ages is 21. write it as c + a + p = 21
first solve for peters age in terms of alex's age.
c = p + 7 or
(a + 5) = p + 7 or
p = (a + 5) - 7 or
p = a - 2
substitute in and solve the equasion:
(a + 5) + a + (a - 2) = 21 or
3a + 3 = 21 or
3a = 24 or
a = 8

c = a + 5 or
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c = p + 7 or
p = c - 7 or
p = 13 - 7 = 6

cindy is 13, alex is 8 and peter is 6
This is called simultaneous equasions and will always work if you have the same number of unknowns as you have equasions (or relationships).

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