self Maths Puzzle

there are three people who go to a hotel. they have to pay rs.10 each for a room. afterwards they come to know that the rent is only 9rs. the waiter takes 3 rs from manager to return to them. but,he being dishonest takes away two rupees from it. now, if money would have been returned then, 3*9=27 rupees.two rupees are with waiter. then 27+2=29 rs. then where is that one rupee gone?

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self Other Question

a number whwn divided successively by 4 and 5 leaves remainder1 and 4.when it is divided by 5 and 4 then the remainders will be
a)1,2 b)2,3 c)3,2 d)4,1
ABCD
+CDAB
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BBBB
(What are the A,B,C & D)