A funny mathematics jokes sms

I.Q. Test:
Char zero ek saat likho
.
.
.
Likha?
.
kaise?
.
0000 aise likha?
.
.
.
Fail…
.
.
Correct Ans “4017”
.
Ghar walo ne kitni umido se padhaya,
sab pani mein…