harrisononfire8755 harrisononfire8755

31-01-2018
Mathematics

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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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anchitthawi anchitthawi

31-01-2018

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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