Carol, marcy and diana together have $847.40. marcy has 4
times as much money as carol, and diana has $31.81 less than
marcy. how much money do carol and marcy have altogether?

The  amount of money Carol and Marcy have altogether is  

Step-by-step explanation:

Let

x ----> the amount of money Carol has

y ----> the amount of money Marcy has

z ----> the amount of money Diana has

we know that

----> equation A

----> ----> equation B

----> equation C

substitute equation B and equation C in equation A

Solve for y

Find the value of x

--->

so

The amount of money Carol has is $97.69

The amount of money Marcy has is $390.76

therefore

The  amount of money Carol and Marcy have altogether is equal to

answer: there are x+184 pages in olivia's book.

step-by-step explanation:

let the total number of pages in the book which olive has already read be x.

then if olive has 184 pages left to read, then the total number of pages are in olive's book= pages she has read+pages she has left to read

therefore, the total number of pages in olivia's book=

hence, there are x+184 pages in olivia's book.