Sam read 1/5 on Monday and the final 20 pages on Tuesday. How many pages were there in the book?

Answer 1

Because we know that there were 20 pages left after Sam read the first 1/5 of the book, we can deduce that 20 pages makes up 4/5 of the book.

Therefore, we can set up an equation that looks like:

20= 4/5 (X), where X is the amount of total pages in the book.

To find X, we can divide both sides by 4/5 (or multiply by 5/4, which is the same thing).

We get:

X=25

Lets check our work. If this is correct, then 5 pages would equal 1/5 of the book.

Does (1/5)(25)=5?

Yep!

So we got it.

There are 25 pages in the book.