Uncle Wang raised 45 chickens and ducks, of which the chicken is 4 / 5 of the duck. How many ducks do you raise!

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• 19. 1. A square sheet of iron with a circumference of 1.2 meters. After cutting it into four equal largest circles, how much scrap is left? 2. The land area on the earth is about 3.554 billion square kilometers, and the ocean area is about 300 million square kilometers. Write the ratio of land area and ocean area, and simplify it 3. A kind of liquid medicine is made of powder and water in the ratio of 1:100. If you want to prepare 404kg of this liquid medicine, how many kg of powder and water are needed? The netizen that can please come out formula, the netizen that lists solution idea gets reward cent chance to be higher We have to work out the formula!
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