Coke 3.50 yuan per cup, orange juice 4.80 yuan per cup, two drinks bought 13 cups, cost 52 yuan. Coke bought () cups, orange juice bought

Coke 3.50 yuan per cup, orange juice 4.80 yuan per cup, two drinks bought 13 cups, cost 52 yuan. Coke bought () cups, orange juice bought

Suppose coke bought 3.5x cups, then orange juice bought (13-x) cups
Money spent on coke + money spent on orange juice = 52 yuan
3.5x+4.8（13-x）=52
x=8
13-8 = 5 (cup)

Which is a solution in milk or soybean milk? If it is a solution, what is its solute?
Is soybean milk and milk a mixture? What are their components?

Milk is a kind of emulsion. Usually, milk looks uniform and stable because of the addition of anticoagulants
In addition, if you look at the diameter of the dispersion, colloid is between 1-100 nm in diameter, solution is less than this range, and turbidity is greater than this range. Milk particles are more than 100 nm in diameter, so they are emulsion
Soybean milk is a colloid
They're all mixtures. It's very complicated

Is soymilk and milk a solution? What is it?

Soymilk and milk are a mixture of various dispersions
Page 20 of PEP senior three textbook has the following statement: "milk, soybean milk, porridge and so on are related to colloid."
In fact, in addition to colloid components, milk also contains emulsion components. In addition to colloid components, soybean milk also contains suspension components
In addition, in natural dispersions with water as dispersant, there are usually solution components