The ratio of the present ages of a man and his wife is 6 : 5. Which of the following can’t be a possible ratio of their ages 10 years ago?
Explanation:
Let their present ages be 6x years and 5x years respectively.
Ratio of their ages 10 years ago = 6x-105x-10=6(x-2)+25(x-2) which is more than 6/5.
Only choice (a) violates this condition.
Hence, option (a).
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