The present ages of Amit and his father are in the ratio of 2 : 5 respectively. Four years hence the ratio of their ages will become 5 : 11 respectively. What was the father's age five years ago?
The present ages of Amit and his father are in the ratio of 2 : 5 respectively. Four years hence the ratio of their ages will become 5 : 11 respectively. What was the father's age five years ago?
A 40 yr
B45 yr
C30 yr
D35 yr
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Correct answer is: 35 yr
Explanation:
Suppose the present age of Amit and his father is 2x and 5x respectively.
After 4 years the ratio of their ages,(2x+4):(5x+4)= 5:11
25x+20=22x+4425x−22x=44−20
3x=24
x=8
Age of his father before 5 years
=5x−5
=5×8−5
=40−5
= 35 yr
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