**For better calculation, considering all months is of 30 days , **

1 year = 360 days

Let Grandfather age be D days

Father age be B days

Grandson age be P days

A/q,

**D + B +P = 140 ×360 days**

now,** Grandfather age in year = Grandson age in months**

**so, D = 12 P**

now, **Father age in week = Grandson age in days**

**so, B = 7 P**

now , from first equation,

D + B +P = 140 ×360 days

⇒12P + 7P +P = 140× 360

⇒20 P = 140 ×360

⇒P = 2520 days

= 2520/360 = 7 years

so, B = 7×P = 7×7 = 49 years

and , D = 12 P = 12× 7 = 84 years

so, **Grandson = 7 ****years**

** Father = 49 years**

** Grandfather = 84 years**

Hope this will help you :)