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(a)

If he took  u days to finish book B by reading 32 pages daily,

book B has in total 32u pages and book A has in total (48u + 384) pages.

If he read 12 pages of A daily and 30 pages of B daily, he would have finished book B in  32u /30 days, so total number of Book A has 32u/30×12 + 912 pages in total.

32u/30×12 +912 = 48u + 384

48u – 64u/5 = 528

240u – 64u = 2640

176u = 2640

u = 15

48u + 384 = 1104

Book A has 1104 pages.

(b) 32u = 480

1104 -480 = 624

There are 624 pages more in pages of Book A than Book B

Note: This is quite a messy question, hope there is a simpler solution. 

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