In 2005, the number of days with excellent air quality accounted for 5 / 3 of the whole year?

365 × (3 / 5) = 219 days

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1. 1. Calculation: X-Y of X + y + Y-3 of 2x 2. Calculation: x + 3 of X & # 178; - X-2 divided by (2-x) + X + 3 of X + 1
2. 15 / 2 by 10 / 3 17 / 8 by 4 / 1 25 / 9 by 12 / 5 10 / 6 by 15 / 7 9 / 8 by 4 / 27 7 / 5 by 25 / 11 3 / 2 by 5 / 6 If it's right, I'll offer a reward. If it's wrong, I won't offer a reward 2 of 15 times 3 of 10, 8 of 17 times 1 of 4, 25 / 9 times 12 / 5, 10 / 6 times 15 / 7, 9 / 8 times 4 / 27, 7 / 5 times 25 / 11, 3 / 2 times 5 / 6
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