andrew read 24 pages of a book on Monday. He read 5/12 of the book on Monday and completed the remaining 1/4 on Tuesday. How many pages are in the book?

Answer 1

number of pages ---- x

(5/12)x = 24
x = 24(12/5) = 57.6 ???

You have confusing information.
According to your wording the 24 pages he read on Monday were 5/12 of the total,
but that came out to a partial page.

Is that what you wanted?
Were there perhaps 3 days?

Answer 2

Read what is it on pages 5 12