Steve writes a letter every 3rd day to his friend. He spends 20 minutes writing the letters. It takes 10 minutes to write 1 page. He also writes a long letter at the end of the month which he puts more thought into. It takes twice as long per page but he spends 80 minutes writing. How many pages does he write a month? Let's think first. Chain of thought:
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He writes 30 / 3 = 10 normal letters. Each letter is 20 / 10 = 2 pages. So that is 2 * 10 = 20 pages. His long letter takes 2 * 10 = 20 minutes per page. So it is 80 / 20 = 4 pages. So he writes 20 + 4 = 24 pages.
Therefore, the answer is 24.
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