self Maths Puzzle

Q. Suppose I am having 50 rupees,from which i
spent 20 remain 30
spent 15 remain 15
spent 9 remain 6
spent 6 remain 0
now add all spent
20+15+9+6=50
and add all remain
30+15+6+0=51
From where this 1 come in remaining..??

Read Solution (Total 2)

self Other Question

Q. Find last two digits of 44^70. Q. A man want to enter in a club but he don't have secure password,he wait out side the door and watch how peoples get entry.one person come,door man says 'twelve'he replies 'six'and get in.another person comes ,door man says 'six' he replies 'three' he get in. waiting person decide it's enough to get enter he walked,door man says 'ten' he replies 'five' he don't get in.what he should replied?