Before mixing:

Whole one, quantity x, index quantity a.

Overall 2, quantity y, indicator quantity b (a >; B) yes.

After mixing:

Integer, quantity (x+y), index quantity c.

The following relationship can be obtained:

x×a+y×b=(x+y)c .

Start:

x×(a-c)=y×(c-b).

Get formula:

(A-C): (C-B) = Y: X.

brief introduction

In the sixth grade mathematics, most of the problems are the percentage of sugar water and salt water. In addition, there is the problem of proportional distribution of pesticides, which is actually the application of concentration.

At present, there are few problems in textbooks that two different percentages of sugar water or salt water are mixed into a new solution. The idea of this kind of topic is the same, which is the weight of solution (such as salt+water) × percentage = the weight of solute (such as salt), and the quality of solute remains the same when mixing, so we should grasp the solute and solution.