Question 936574
I see a major fault in the problem description.  You are examining how to mix $2.20 per kg with $1.80 per kg and result in a price of mixture at $3.00 per kg.  NOT POSSIBLE.  Neither material to be mixed is as high priced as the intended mixture.  $3.00 per kg is NOT in range of 2.20 to 1.80.


Recheck your problem description from your learning material carefully.


....Again, understand, the problem description is WRONG.