mooreadrian41235
22.06.2019 •
Mathematics
Identify all the cases where probability sampling is used. studies with specific goals randomly selected samples qualitative research studies targeting tiny populations randomly selected samples within boundaries of a population
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Ответ:
How much pure Sum. beans are we talking about here?
0.20x + 0.80y = 0.60(5 lb) Mult all 3 terms by 100 to remove fractions:
20x + 80 y = 300. Subst. 5-y for x:
20(5-y) + 80y = 300 => 100-20y + 80y = 300 => 60y = 200, and so
y = 20/6 or 10/3 lb
Then x = 5-10/3, or x =5/3 lb
Use 5/3 lb of the first blend and 10/3 lb of the second blend to come up with 5 lb of a 60% blend.