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Two math problems in volume two of grade one! Help me if you can do them! For a container full of liquid medicine, pour out 10L and fill it with water. Then pour out 10L and fill it with water. At this time, the ratio of pure medicine and water in the container is 16:9? According to market research, the relationship between the selling price of the goods and the sales volume is: if the selling price of each product is a yuan, then (320-10a) pieces can be sold, but the price department limits that the price increase of each product can not exceed 25% of the purchase price, How much should be the selling price of each product? How many products should be sold? Thank you, today, I'm in a hurry ~ ~! Help, thank you!
Let the volume of the container be X
（x-10-10）9=20x16
x=100/3
A: the volume of the container is 100 / 3L
According to the meaning of the title:
(320-a)(a-18)=400
The results are as follows
a^2-50a+616=0
The results are as follows
A = 28 or a = 22
When a = 28: (28-18) / 18 = 55.56% > 25%
Therefore, the price of each product should be 22 yuan
The number of pieces sold is:
320-10 × 22 = 100 pieces
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