Answer: 17 pages
Step-by-step explanation:well you would have to divide 544 by 9 to see hao many pages you would need for the blue book
544/9= 60.44 which would be 61
then you would have to divide 544 by 7 to see hao many pages you would need for the red book
544/7= 77.71 which would be 78
the you would subtract 78 by 61 to see how many more pages you would need