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There is a pile of coal. After 40% of the total coal is used up, another 30 tons are transported. At this time, the amount of coal is 20% more than the original coal. How many tons of this pile of coal are there emergency
30÷（40%+20%）
=30÷60%
=50 tons
What percentage is 1.80 km more than 60 km? What percentage is 2.18 tons less than 20 tons?
1.(80-60)/60=33.3%
2.(20-18)/20=10%
1 out of 18 (2 out of 3 + 1 out of 6-1 out of 2) =?
1 / 18 (2 / 3 + 1 / 6-1 / 2)
=1/18 ÷（4/6+1/6-3/6）
=1/18 ÷ （5/6-3/6）
=1/18÷2/6
=1/18×3
=3/18
=1/6
A pile of coal consumed 72% and transported in 180 tons. At this time, it is 8% more than the original. How many tons of this pile of coal was used?
After 72% is used, there is 28% left. When it comes in, it becomes 108%
The imported part accounts for 108% - 28% = 80%
Therefore, the original 180 △ 80% = 225 tons
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