There are several types of problems of this kind:

However, to solve all problems of this kind, we first need to understand what **concentration** is = \frac{volume\ of\ solute}{total\ volume=volume\ of\ solute+volume\ of\ solvent} or it's simply the ratio of the volume of the solute to the total volume of the solution.

Therefore, we can restate the problem in terms of ratio.

Annabel has 25 ounces of a boric acid solution where the ratio of the volume of the boric acid to the total volume is 1/5. She wants to make the ratio of the volume of the boric acid to the total volume to be 1/10. How much water does she needs to add?

This is a linear equation in one variable. Let x be the number of ounces she needs to add. Let's calculate the starting volume of boric acid and water, since the ratio of boric acid to total is 1/5, this means that 1/5 of 25 ounces is boric acid and 4/5 of 25 ounces is water. Therefore, we have 5 ounces of boric acid and 20 ounces of water.

Since, we want the final concentration to be 1/10 or the ratio of volume of the boric acid to total volume is /10, we have 5/(x + 25) = 1/10. Therefore, 50 = x + 25 and x = 25.

If you can do problems of the following kind, you can handle any mixture problems.

The ratio of boys to the total number of students in a class of 25 students is 1/5. How many more girls should be added to the class so that the ratio of boys to the total number of students in the class becomes 1/10.

PLZ HELP ME!!!!! I NEED HELP WITH THIS THX TO WHOEVER HELPS!!!

Mixture is made whenever different types of items are combined to create a third, “mixed” item.

In the mathematics, mixture problems involve creating a mixture from two or more things, and then determining some quantity (percentage, price, rate, etc) of the resulting mixture.

EXAMPLE: if you mix 10 liters of pure water with 15 liters of a 30% alcohol solution, what is the concentration of the resulting mixture?

EXAMPLE 2: if you mix 10lbs of peanuts costing $1.50 per pound with cashews costing $2.50 per pound, how many pounds of cashews would you need to add so that the resulting mixture has a cost per pound of $1.95?

Read more:

https://www.purplemath.com/modules/mixture2.htm

http://www.analyzemath.com/math_problems/mixture_problems.html

Can you share more information on what you mean by mixture problems?

Are you something along the lines of https://www.purplemath.com/modules/mixture.htm?