self Maths Puzzle

three friends are going in ahotel he paid 30 rupee but the atual payment is 25.the water returns 1 rupee for each person then he paid 9 rupee each tnats means 27paid and 2 rupee for watre total is 29. where 1 rupee going

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self Other Question

A series is given as 1,6,7,13,20,33,..... find the sum of first 52 terms the weight of juice is 25% by weight of the glass filled with water.if you drink 50% of the juice by weight then the weight of remaining juice is what fraction of the weight of the glass