The present age of father is 42 year and his Son is 12 years. The ratio of the father to his Son 2 years ago was -a)7 : 2b)4:1c)2:7d)1:4Correct answer is option 'B'. Can you explain this answer?

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The present age of father is 42 year and his Son is 12 years. The ratio of the father to his Son 2 years ago was -

a)
7 : 2
b)
4:1
c)
2:7
d)
1:4

Correct answer is option 'B'. Can you explain this answer?

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