Answer:
150=
x, or 4(150)=x
Explanation:
Let's use x to represent the total number of pages in the book.
If 150 is a quarter of the whole book, then 150 is equal to a quarter of x
150= .25(x)
We an go further and multiply both sides by 4 to cancel the .25
4(150)=x
We can finish solving and x=600 pages