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In order to encourage residents to save water, a city charges tap water users according to the following standards: if the monthly water consumption of each household does not exceed 12 tons, 1.8 yuan per ton will be charged; if the monthly water consumption exceeds 12 tons, 3.6 yuan per ton will be charged for the excess part; if the monthly water consumption of a household is 50.4 yuan, how many tons of water does the household share
Design water x tons
12 * 1.8 = 21.6 yuan < 50.4 yuan
The user uses more than 12 tons of water
There are 21.6 + 3.6 * (x - 12) = 50.4
We get x = 20
A: 20 tons of water
If you save 700 grams of water per person per day, how many tons of water can 1000 people save per month (30 days)?
700 * 1000 * 30 = 21000000 g = 21000 kg = 21000 t
If you save 680 grams of water per person per day, how many tons of water can 800 people save in a month (30 days)?
16.32 tons
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- 8. How large is the Forbidden City?
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- 10. The summer palace in Beijing covers an area of 290 hectares, of which the ratio of water surface area to land area is 3:1?
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- 12. In order to encourage residents to save water, a city charges tap water users according to the following standards: If the monthly water consumption of each household does not exceed a ton, it will be calculated as m yuan per ton; if the monthly water consumption exceeds a ton, the excess will be calculated as 2m yuan per ton?
- 13. Use scientific notation! one point two four zero zero zero two zero zero zero two point eight zero zero zero one zero zero 3.0.0000000801 4.0.0000521 5.0.10001
- 14. Using scientific notation: 700000
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- 18. -0.0000025 is expressed by scientific notation as______ ．
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