Solution:

120 times

Solution:

the seven seas

Solution:

As noted, all three are 140 years old. Thus, a+b+c=140, where a is grandfather, b is son, and c is grandson. Additionally, grandson being about as many days old as son is in weeks gives 365c=52b. Finally, the grandson being as many months as I am in years gives 12c=a. Thus, the following are known.

a+b+c=140
365c=52b or b=365c/52
12c=a

By calculation and substitution we have as follows.

12c + 365c/52 +c = 140
624c + 365c + 52c = 7280
1041c = 7280
c = 6.99, or 7 (teaser said 'about')
so, as 12c = a, then a = 84.

I am 84 years old.
As an aside, my son is 49

Solution:

Because he was born before 1947(before pakistan exists) and hence is an indian citizen

Solution:

The nail would be at the same height since trees grow at their tops.

Solution:

N for November

M: March
A: April
M: May ....and so on ...

Solution:

The Past

Solution:

Once in a blue moon

Solution:

Sadaf had 50pound and Tanu had 30 pound.

Sadaf Tanu
50 30
20 60
40 40
0 80

Solution:

Heat bcoz you catch cold but not heat