100 kg of fruit with 90% water content is delivered from the warehouse. A week later, it was measured again and found that the water content was reduced to 80%. What is the total weight of this batch of fruit now?
There are three plots, the second plot is 80% of the first plot, the third plot is 20% more than the second plot, and the third plot is 69 hectares. How many hectares are there in each plot?
1.20
2.50
3. The first, second and third plots are 25, 20 and 24 hectares respectively.
Solution: The first plot area is 69 ÷ [1+80% × (1+20%)] = 25 (ha), the second plot area is 25× 80% = 20 (ha), and the third plot area is 69-20.