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A man is 20 yr older to his son. The present age of the, son is 30 yr. How many years ago was the ratio of their ages 1 : 2 ?

(a) 18 yr
(b) 20 yr
(c) 10 yr
(d) 15 yr


Let the age of son be y
Now present age of son is 30,therefore present age of father is 30+20=50
Age before z years=30-z and 50-z
Now (30-z)2=(50-z)1
therefore it was 10 years before was their ages ratio 1:2 
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