



 
Hi Jerry, Read the first three sentences in the problem carefully. The first sentence says that if you know the number of pages in book 3 you can tell the number of pages in book 1. The second sentence says that once you know the number of pages in book 1 you can tell the number of pages in book 2. The third sentence says that if you know the number of pages in books 1 and 2 you can tell the number of pages in book 4. Hence the number of pages in book 3 is the key, if you know it you can calculate the number of pages in each book. Since the number of pages in book three is the key I am going to let it be the variable I use in my solution. Let the number of pages in book 3 be n. From the first sentence the number of pages in book 1 is 2n. How many pages are in book 2? How many pages are in book 4? Add the number of pages in the four books. This must be 567. Solve for n. I hope this helps,  


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