Others Maths Puzzle

Q. In a mess for 30 borders , when the number of boarders is increased y 10, the expenses were increased by Rs 40 p.m and average expenditure per head decreased by Rs 2. find the original monthly expenses,

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Others Other Question

Q. In a pile of 10 books there are 3 of History, 3 of Hindi, 2 of Maths and 2 of English. Taking from above there is an English book between a History and Maths book, a History book between a Maths and an English book, a Hindi book between an English and a Maths book, a Maths book between two Hindi books, and two Hindi books between a Maths and a History book. Book of which subject is at the sixth position from the top? Q. what is the next number of the following sequence
2, 35, 104, 209,.....