Aptitude - Problems on Ages - Discussion
Discussion Forum : Problems on Ages - General Questions (Q.No. 10)
10.
Sachin is younger than Rahul by 7 years. If their ages are in the respective ratio of 7 : 9, how old is Sachin?
Answer: Option
Explanation:
Let Rahul's age be x years.
Then, Sachin's age = (x - 7) years.
 |
x - 7 | = | 7 |
| x | 9 |
9x - 63 = 7x
2x = 63
x = 31.5
Hence, Sachin's age =(x - 7) = 24.5 years.
Discussion:
48 comments Page 4 of 5.
Soys said:
1 decade ago
Let sachin age be x and rahul age be x+7.
x/x+7 = 7/9.
9x = 7x+49.
9x-7x = 49.
2x = 49.
x = 24.5.
x/x+7 = 7/9.
9x = 7x+49.
9x-7x = 49.
2x = 49.
x = 24.5.
Punya said:
1 decade ago
R-S = 7.
S/R = 7/9.
Where R = 9S/7.
Substitute in first equation:
9S/7-S = 7.
S = 24.5 years.
S/R = 7/9.
Where R = 9S/7.
Substitute in first equation:
9S/7-S = 7.
S = 24.5 years.
Jilan said:
9 years ago
Let Sachin's age be 'x' years.
Then, Rahul's age = (x+7) years.
x/x+7 =7/9 =>x=24.5 years.
Then, Rahul's age = (x+7) years.
x/x+7 =7/9 =>x=24.5 years.
Ashok said:
1 decade ago
9x-7 = 7x.
9x-7x-7 = 0.
2x-7 = 0.
2x = 7.
x = 7/2.
Sachin age = 7x = 7*7/2 = 49/2 = 24.5 yrs.
9x-7x-7 = 0.
2x-7 = 0.
2x = 7.
x = 7/2.
Sachin age = 7x = 7*7/2 = 49/2 = 24.5 yrs.
Refrist said:
6 years ago
Let Rahul age be x.
Sachin age be x+7.
Then thier ratio is x/x+7=7/9.
9x=7x +49.
X = 24.
Sachin age be x+7.
Then thier ratio is x/x+7=7/9.
9x=7x +49.
X = 24.
Prathyusha said:
10 years ago
Can anyone explain me?
Father's age is 5 times the son's age means 5 (x) but why x+6?
Father's age is 5 times the son's age means 5 (x) but why x+6?
Rupali said:
1 decade ago
if sachin is younger than rahul, this means that his age is less than rahul,i.e. >7
Pooja said:
1 decade ago
Sachin = x.
Rahul = x+7.
x/x+7 = 7/9.
9x = 7x + 49.
9x - 7x = 49.
2x = 49.
x = 24.5.
Rahul = x+7.
x/x+7 = 7/9.
9x = 7x + 49.
9x - 7x = 49.
2x = 49.
x = 24.5.
Akansha said:
6 years ago
Let Sachin's age be x.
And Rahul's age be x+7,
So, x/x+7=7/9,
9x=7x+49,
X=24.5.
And Rahul's age be x+7,
So, x/x+7=7/9,
9x=7x+49,
X=24.5.
(2)
Mamta said:
1 decade ago
Sachin = x.
Rahul = x+7.
x/x+7 = 7:9.
9x = 7x+49.
2x = 49.
x = 24.5.
Rahul = x+7.
x/x+7 = 7:9.
9x = 7x+49.
2x = 49.
x = 24.5.
(1)
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