Math

Rohan have some books and some tables.If he puts 9 books into each table he will have two tables left vacant. if he puts 6 books on each table he will have 3 books left over. find the number of books?

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  1. 9, 18, 27, 36, 45
    6, 12, 18, 24, 30, 36, 42

  2. Yes, 45 books

  3. well, let the number of books is x
    so as after putting 9 books on a table 2 tables left vacant, number of table becomes (x/9+2)
    again if we put 6 books on each of the table 3 remains, so now
    books on the table+3= total books
    I.e: (x/9+2)6+3=x
    solution: x=45

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    posted by Rittick
  4. 45

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  5. 45

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    posted by Kuldeep
  6. 45

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    posted by Anuj
  7. Suppose there are B books and T tables

    If he puts 9 books on each table he will have two tables left vacant.
    B = 9(T-2)

    If he put 6 books on each table he will have 3 books left over.
    6T+3 = B

    6T+3 = 9(T-2)
    6T+3 = 9T-18
    21 = 3T
    7 = T

    6T+3 = 6(7)+3 = 42+3 = 45 = B

    So there are 7 tables and 45 books.

    Checking: Putting 9 books on 5 tables takes all 45 books,
    and there will be 7-5 = 2 tables with no books.

    Putting 6 books on all 7 tables takes 42 books,
    and there will be 45-42 = 3 books left over.

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