Question 45662
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Hello, in your post you call this problem as a "mixture problem".


Actually, it is not a "mixture" problem and never was.


The problems of this kind have their traditional name, which is "joint work" problems.


Do not create your own names for subjects in the area, where they are well established 
just for hundred years and with which you are unfamiliar with.


Making disorder in a well ordered space is not a good style and is disrespect to traditions.


Besides of it, it shows that you don't know a standard terminology, 
which is not in your interests to demonstrate around.