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6 October, 01:33

I read 1/4 of a book on saturday and 2/5 of the remainder on sunday. if 36 pages still remain to be read, how many pages are there in this book altoghether?

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  1. 6 October, 02:38
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    If all pages = x

    on saturday = 1/4 x

    on sunday = 2/5 * (x-1/4 x) = 2/5 * 3/4 x = 3/10 x

    then remaining pages = 36 = x-1/4 x - 3/10 x

    (multiplied by 20)

    720 = 20x-5x-6x

    720 = 9x

    so x = 80

    Answer: There are 80 pages in this book altogether.
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