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:
49 comments Page 2 of 5.
Abhijeet kumar singh said:
8 years ago
Let Sachin age is = x year and Rahul age is x+7 year.
Then we can calculate by using the given respective ratio 7:9.
= x/x+7=7/9 when we solve this equation we got 24.5.
Then we can calculate by using the given respective ratio 7:9.
= x/x+7=7/9 when we solve this equation we got 24.5.
(1)
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)
Arun said:
1 decade ago
Ratio of their ages 7:9 ie, let the ratio of sachin & Rahul's present ages be 7x and 9x respectively and
As the question says Sachin is younger than Rahul by 7 yrs., we can write it as.,
9x = 7x + 7
2x = 7
x = 3.5
Therefore sachin's present age = 7x = 7*3.5 = 24.5 ans.
As the question says Sachin is younger than Rahul by 7 yrs., we can write it as.,
9x = 7x + 7
2x = 7
x = 3.5
Therefore sachin's present age = 7x = 7*3.5 = 24.5 ans.
(1)
Pavi said:
5 years ago
Sachin and Rahul age be: 7x : 9x.
Gn, Sachin is seven yrs younger than Rahul
So, 9x -7 = 7,
X = 3.5.
By substituting x value in 7x we get an answer.
Gn, Sachin is seven yrs younger than Rahul
So, 9x -7 = 7,
X = 3.5.
By substituting x value in 7x we get an answer.
(1)
Prakash said:
4 years ago
Thank you @Anish.
(1)
Kinjal said:
1 decade ago
Here Rahul should suppose to b "X".
Pardeshi said:
1 decade ago
My best way is that the ratios difference is 2.
So result is 7 years older so 1 ratio = 7/2 years, = 3.5 years.
So Sachin's age is from ratio = 3.5*7 = 24.5 answer.
So result is 7 years older so 1 ratio = 7/2 years, = 3.5 years.
So Sachin's age is from ratio = 3.5*7 = 24.5 answer.
Prathyusha said:
1 decade 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?
Gowthami said:
1 decade ago
Present age of Rahul is x.
Sachin is 7 years older than Rahul so x+7.
Their ratio is 7:9.
x/x+7 = 7/9 cross multiplication is 9x = 7x+49.
9x-7x = 2x. So x = 49/2 = 24.1/2 = 24.5.
So this is my suggestion I hope you all are clear with that.
Sachin is 7 years older than Rahul so x+7.
Their ratio is 7:9.
x/x+7 = 7/9 cross multiplication is 9x = 7x+49.
9x-7x = 2x. So x = 49/2 = 24.1/2 = 24.5.
So this is my suggestion I hope you all are clear with that.
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.
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