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UPSC 2014 CDS I Math Paper
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© examsnet.com
Question : 9
Total: 100
The present age,of Ravi’s father is'four times Ravi’s present age. Five years back he was seven times as old as Ravi was at that time. What is the present age of Ravi’s father ?
[2014 CDS-I]
84 years
70 years
40 years
35 years
Validate
Solution:
Let the present age of Ravi be x years.
So, present age of Ravi’s father= 4x years
Five years ago, Ravi’s father’s age = 7 × Ravi’s age
∴
4
x
−
5
=
7
(
x
−
5
)
⇒
7
x
−
4
x
=
35
−
5
⇒
3
x
=
30
⇒
x
=
10
Therefore, present age of Ravi’s father
=
4
×
10
=
40
years
© examsnet.com
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