84: 1,2,3,4,6,7,12,14,21,28,42
108: 1,2,3,4,6,9,12,18,27,36,54,108
Therefore, your G.C.F. is: 12
For every 1 book Chloe reads, Peyton reads 11 books
For this you can write equations for your business and your friend's. For your's it would be y=10x-25 and for your friend's it would be y=13x-55. Now at this point you can just plug in numbers until you match up. Your answer would be 10, if you want to you can plug it in to check.
Answer:
180
Step-by-step explanation:
18x40=720
720/4= 180