How many pages are there in the book?
I. Lesson 8 and 9 take only 20 pages and at least five lessons take 13 pages each.
II. There are 14 lessons in the book. Lesson no. 6 takes 14 pages while six other lessons take 12 pages each.
From both I and II, 8 and 9 lessons take 20 pages. Lesson 6 takes 14 pages. “Lesson 8 and 9 take only 20 pages and at least five lessons take 13 pages each.” ∴ 6 × 12 = 72 Total no. of lessons = 14 ∴ Remaining lessons = 14 – 9 = 5 Remaining pages = 5 × 13 = 65 ∴ Total no. of pages = 20 + 14 + 72 + 65 = 171. Hence both I and II are sufficient to answer the question.
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