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RRB RPF RPSF SI and CONS Model Papers 6 with solutions
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© examsnet.com
Question : 15
Total: 120
The average age of a man and his son is 30 years. Four years ago, the ratio of their ages was 10 : 3. What is the difference between the present ages of the man and his son?
28 years
16 years
26 years
44 years
Validate
Solution:
(1) Let the present ages of man and son be M and S, respectively.
According to the question,
(
M
+
S
)
2
=
30
⇒M + S = 60 .....(1)
Also,
M
−
4
S
−
4
=
10
3
⇒10S – 3M = 28 ......(2)
On solving (1) and (2), we get
S = 16 and M = 44
Therefore, M – S = 28 years.
© examsnet.com
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