At present, the respective ratio of the sum and the difference of the age of son and grandfather is 5 : 4. Five years later, the respective ratio of the age of son and grandfather becomes 1 : 5. What is the difference between the age of grandfather and that of son?

At present, the respective ratio of the sum and the difference of the

1.	At present, the respective ratio of the sum and the difference of the age of son and grandfather is 5 : 4. Five years later, the respective ratio of the age of son and grandfather becomes 1 : 5. What is the difference between the age of grandfather and that of son?
A.	50 years
B.	45 years
C.	42 years
D.	48 years
E.	None of these
Answer» F.

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At present, the respective ratio of the sum and the difference of the age of son and grandfather is 5 : 4. Five years later, the respective ratio of the age of son and grandfather becomes 1 : 5. What is the difference between the age of grandfather and that of son?

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