Question
Average number of pages in 54 books is 240. Two more
books with pages (b + 20) and (b - 8) are added, and the average becomes 242. Find (b - 100).Solution
56 × 242 − 54 × 240 = b + 20 + b − 8
2b + 12 = 13,552 − 12,960 = 592
2b = 580
b = 290
b − 100 = 290 – 100 = 190
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