according to the conditions given in the question,
grand daughter's days= daughter's weeks
grand daughter's months = her years,
let x= age (in years) of old lady herself
y = age (in years) of her daughter
z= age (in years) of her grand daughter
therefore , x+y+z=140 (1)
365z=365/7 * y (2)
solving the above three equations we get
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