Question

After reading 5/9 of a book, 72 pages are left unread. how many pages are there in a book .
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Answer 1

$\huge \bold{heya \: mate}$

Let us assume that there are x number of pages in the book.

Then,

➡5/9 of x+72=x

➡5x/9+72=x

➡72=x-5x/9

➡72=9x-5x/9

➡72=4x/9

➡72×9=4x

➡648=4x

Therefore,

↪x=162

There are 162 pages in the book.