Their total age is 140 Years. Tell the Exact age of all.

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Test your brains?★
One grandfather
One Father
One grandson
Their total age is 140 years respectively
Grandson in months old is equal to the age of his Grandfather in years
Grandson in days old is equal to the age of the Father in Weeks★
Now tell the exact age of all!★

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GrandSon = 7 Yrs
Father = 49 Yrs
GrandFather = 84 Yrs