Math problem.

john_unai

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I have a 100m3 end product that fully produced from 850kg/m3 density raw material, this will give me end product with density of 850kg/m3.
Now i have 100m3 end product that produced from combination of 70% of raw material with density of 850kg/m3 and 30% of raw material with 450kg/m3 density. what will be my new density of end product? is it 0.7(850) + 0.3(450) = 730kg/m3? I'm losing my basic calculating ability. :bawling::bawling::stupid::stupid:
 
different materials may have diff wastage due to manufacturing process and how the materials respond to it..

see how i answered you without answering you. i fail maths too.
 
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