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Stan wants to arrange his books in order of size. Half of the books are medium, 2/10 are large and 12 are small. What is the total number of books Stan has?

  • math -

    7/10 of the books are not small.

    3/10x = 12
    x = 12 / (3/10)
    x = 12 * (10/3)
    x = 120/3
    x = 40

  • math -

    let, total number of books= X
    Small= 12
    Remaining books = X-12
    now,the remaining books comprise:
    1/2X= Medium
    2/10X= Large
    Therefore,
    1/2X+2/10X=X-12
    Solve for X and you will get the answer!!

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