There are 1500 chickens and ducks in a feed factory. One quarter of the chickens are 15 less than 40% of the ducks. How many chickens and ducks are there in the feed factory?

900 chickens, 600 ducks

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1. 1 / 4 of 1500 chickens and ducks raised in a farm is 15 less than 40 / 100 ducks (equation)
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11. There are 1500 chickens and ducks in a feed farm. One quarter of the chickens are 15 less than 40% of the ducks. How many chickens and ducks are there? The answer I know is the process, the process of calculation and the step-by-step calculation How to solve it It's not the same. My equation is: let's have X ducks Quarter (1500-x) = 40 ‰ X-15 375-X/4=0.4X-15 X=600 1500-600=900 So there are 600 ducks and 900 chickens. How does this formula come from?
12. The ratio of chickens to ducks is 5:2. After 120 chickens are sold, this is the ratio of chickens to ducks, which is 9:4
13. A total of 3870 chickens and ducks are raised in the farm. The number of chickens is 2.5 times that of ducks, and there are 20 more. Now all of them are sold. A chicken costs 4.5 yuan. How much is the total income of the farm
14. The feeding group raised a total of 1720 chickens and ducks, sold half of the chickens and bought 260 ducks. At this time, the number of chickens and ducks was equal
15. (1) A total of 1720 chickens and ducks were raised by the feeding group. Half of the chickens were sold and 260 ducks were bought. At this time, the number of chickens and ducks was the same How many ducks? (2) There are two reservoirs A and B. There are 3000 cubic meters of water in pool a and 1200 cubic meters of water in pool B. now the water is diverted from pool a to pool B at a flow rate of 50 cubic meters per minute. How many minutes later, the water storage in Pool B is twice that of pool a? (3) A total of 340 peach and apricot trees are planted in the orchard, of which the number of peach trees is three times more than that of apricot trees, 20 more. How many of the two kinds of trees are there? (4) There is 470 kg of oil in barrel a and 190 kg of oil in barrel B. how many kg of oil in barrel a can make barrel a oil twice as much as barrel B oil? There are a lot of questions. I really can't help it
16. There are 450 chickens and ducks in the farm. After half of the chickens sold and 30 ducks bought, the chickens are twice as many as the ducks. How many chickens and ducks are there?
17. There are 5000 chickens, ducks, geese and sheep in Fuyu farm, 5% of which are sheep, 40% of which are chickens, 25% of which are ducks and 30% of which are geese Q: (1) how many percent more chickens than ducks? (2) how many percent less sheep than geese?
18. There are 216 chickens, ducks and geese, 4 / 9 of which are ducks. The ratio of chickens to geese is 3:2. How many chickens and geese are there?
19. There are 216 chickens, ducks and geese, 4 / 9 of which are ducks. The ratio of chickens to geese is 2:3. How many chickens and ducks are there
20. 3. The ratio of chickens, ducks and geese in the farm is 4:3:2. This farm has 240 more chickens than geese. How many chickens, ducks and geese are raised in this farm 3. The ratio of chickens, ducks and geese in the farm is 4:3: 240 more chickens are raised in this farm than geese. How many chickens, ducks and geese are raised in this farm?