David read 1/5 of a book on the first day. On the second day, he read 75% of the remaining pages. He had 75 pages left to read. How many pages were there in the book?(help me in 5 minutes please)
On the first day, he read 1/5 of the book, so the remaning is 4/5.
On the second day, he read 75% from the remaning (4/5), so 0.75*4/5 = 3/5.
so now he read 1/5 + 3/5 = 4/5 of the book.
the remaning is 1/5, and the question say that he had 75 pages left, so 1/5 of the book = 75 pages
and now you can solve this as an eqation
1/5x = 75
so the book contain 375 pages .
hope this is helpful