Final answer:
To calculate the total pages Arun has read, add the pages from both books, resulting in 711 pages.
Step-by-step explanation:
The student has asked how many pages Arun has read by adding the pages from his first and second book. To calculate the total pages Arun has read, we simply need to add the page counts of the two books together:
Pages of the first book: 345 pages
Pages of the second book: 366 pages
Total pages read by Arun = 345 + 366 = 711 pages