Know the Age
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Can you find the ages of a son, father and grandfather based on the following facts?
The sum of the ages of grandfather, father and son is 140 years.
The age of the son in months is the same as the grandfather in years.
The age of the son in days is the same as the father in weeks. 
The sun is 7 years old
The father is 49 years old and the grandfather is 84 years old.
The trick here is that the father age in weeks is not his age * 52 (weeks in a year) but multiply by 365(days in a year)/7 (days a week) because every 7 years we get one more week.
the age of the sun in days is 7*365 = 2555 add the father age in weeks is 49*365(days)/7(days a week) = 2555
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