As per Formula:
(If the given ages in a ratio a : b then age will be ax and bx)
so persons age will be 2x, 4x and 6x respectively.
Their age average is 60
so (2x+4x+6x)/3 = 60
=> 12x = 60 * 3
=> x = 180/12 = 15
so age of youngest is 30 years.
Workspace
NA
SHSTTON
48
Solv. Corr.
64
Solv. In. Corr.
112
Attempted
1 M:31 S
Avg. Time
22 / 73
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When Rajeev was born, his father was 32 years older than his brother and his mother was 25 years older than his sister. If Rajeev's brother is 6 years older than Rajeev and his mother is 3 years younger than his father, how old was Rajeev's sister when Rajeev was born?
As per the formula( If the given ages in a ratio a : b then age will be ax and bx.)
so A and B age will be 8x and 5x respectively.
=> 8x+5x = 39 => 13x=39
=> x=39/13=3
A nad B age will be 25 and 15 respectively.
After 9 yr,
A and B age will be 33 and 24.
So, the ratio of their ages A:B::11:8
Workspace
NA
SHSTTON
65
Solv. Corr.
102
Solv. In. Corr.
167
Attempted
2 M:4 S
Avg. Time
24 / 73
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The sum of the present ages of a father and his son is 60 years. Six years ago, father's age was five times the age of the son. After 6 years, son's age will be:
Let the present ages of son and father be x and (60 -x) years respectively.
Then, (60 - x) - 6 = 5(x - 6)
=> 54 - x = 5x - 30
=> 6x = 84
=> x = 14.
Son's age after 6 years = (x+ 6) = 20 years..
Workspace
NA
SHSTTON
10
Solv. Corr.
6
Solv. In. Corr.
16
Attempted
0 M:0 S
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25 / 73
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Ten years ago, chandrawathi's mother was four times older than her daughter. After 10years,the mother will be twice older than daughter. The present age of Chandrawathi is:
Let Chandrawathi's age 10 years ago be x years.
So Her mother's age 10 years ago = 4x
=> (4x+10)+10=2(x+10+10)
=> x=10
So, Present age of Chandrawathi = (x+10) = 20 years
Workspace
NA
SHSTTON
1
Solv. Corr.
8
Solv. In. Corr.
9
Attempted
0 M:23 S
Avg. Time
26 / 73
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Diophantus passed one sixth of his life in childhood, one twelfth in youth, and one seventh more as a bachelor; five years after his marriage a son was born who died four years before his father at half his final age. How old is Diophantus?
lets assume son age=x
fathers age=5x
4 years back, so (x-4)=(5x-4)
then father was 9 times older than son so, 9(x-4)=(5x-4).....(1)
solving eqn (1), x=8
and fathers age =8*5=40 years
Workspace
NA
SHSTTON
11
Solv. Corr.
4
Solv. In. Corr.
15
Attempted
0 M:0 S
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28 / 73
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A father is 30 years older than his son however he will be only thrice as old as the son after 5 years what is father's present age ?
Lets assume son's age = x
So, father's age = x + 30
After 5 years:
Son's age = x + 5
Father's age = x + 35
In 5 years the father is thrice as old as his son so:
3(x + 5) = x + 35
x = 10
So, current father's age = 40 Years.
Workspace
NA
SHSTTON
9
Solv. Corr.
3
Solv. In. Corr.
12
Attempted
0 M:0 S
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The ratio of the ages of Swati and Varun is 2 : 5, After 8 years, their ages will be in the ratio of 1 : 2. The difference in their present ages (in years) is?
Let Swati's age = 2X and Varun's age = 5X
(2X + 8)/(5X + 8) = 1/2 => X = 8
Swati's age = 16 years
and Varun's age = 40 years
Difference of their ages = 24 years.
Workspace
NA
SHSTTON
30
Solv. Corr.
23
Solv. In. Corr.
53
Attempted
0 M:0 S
Avg. Time
30 / 73
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A person's present age is two-fifth of the age of his mother. After 8 years, he will be one-half of the age of his mother. How old is the mother at present?
Lets assume mother's present age = x years
So, the person's present age = 2/5 x years
As per the question:
=>(2/5 x + 8) = 1/2 (x + 8)
=> 2(2x + 40) = 5(x + 8)
=> x = 40
So Mother present age = 40 years.
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