General Maths Puzzle Category

Three friends went to a hotel and they want to stay in a room and they asked the manager the cost of room to stay for one night he said 30 rupees. then each gave 10 rupees and finally they gave 30Rs. Then they went to room ,suddenly manager remembered that room costs 25Rs. He gave 5Rs to boy to give to friends. The boy took 2Rs in that and he distributed 3Rs among the three. so each paid 9RS total 3*9=27 and the boy has 2Rs with him so 27+2=29
finally where is the 1Rs

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General Other Question

What is the next number of the following sequence
11 40 93 17 68 29
There are two sand-glass timers.One of them takes 7 minutes for
sand to filter through and the other takes 11 minutes.How will you
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