Stephanie is cooking bread. The recipe calls for 54 cups of flour. She has already put in 3.0 cups. How many more cups does she
need to put in ?

When you answer this can you explain

How are algebraic expressions evaluated using substitution?

Tyler reads 2/5 of a book on monday, 1/3 of it on tuesday, 2/9 of it on wednesday, and 3/4 of the remainder on thursday. if he still has 14 pages left to read on friday, how many pages are there in the book?