Emily has a book with 200 pages , she read 150 pages , what's the percentage of books she read?

150/200 = 3/4 = .75 = 75%

To find out the percentage of pages Emily has read, you need to divide the number of pages she read (150) by the total number of pages in the book (200), and then multiply by 100. This is because a percentage is a fraction of 100, representing a proportion or ratio.

The formula to calculate the percentage is:

Percentage = (Number of pages read / Total number of pages) x 100

So, in this case:

Percentage = (150 / 200) x 100

Simplifying this equation gives us:

Percentage = 0.75 x 100

Therefore, Emily has read 75% of the book.