SOLUTION: Joe's Dairy Farm has 100 gallons of milk that is 4.6% butterfat. How much skimmilk (no butterfat) should be mixed with it to make milk that is 3.2% fat?
________gallons of milk sh
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-> SOLUTION: Joe's Dairy Farm has 100 gallons of milk that is 4.6% butterfat. How much skimmilk (no butterfat) should be mixed with it to make milk that is 3.2% fat?
________gallons of milk sh
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Question 40186: Joe's Dairy Farm has 100 gallons of milk that is 4.6% butterfat. How much skimmilk (no butterfat) should be mixed with it to make milk that is 3.2% fat?
________gallons of milk should be added.
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A chemist has one solution that is 80% acid and another soulution that is 30% acid. How much of the first (80%) solution is needed to make a 400L solution that is 62% acid?
__________liters of the 80% solution is required.
Thanx Answer by longjonsilver(2297) (Show Source):
Anyway:
1. We cannot think about "amounts of butterfat, since the skimmed has none: its percentage is zero. So i have turned it around and considered the percentage of non-fat milk in the milk: the skimmed will be 100%.
100*0.954 + x*1.00 = (100+x)*0.968
95.4 + x = 96.8 + 0.968x
x - 0.968x = 96.8 - 95.4
0.032x = 1.4
x = (1.4)/(0.032)
x = 43.75 gallons
2. Start with 80% acid and a 30% acid.
--> Let there be x litres of the 80% solution acid. So, how much of the 30%? Answer is "the rest of the 400 litres ie (400-x). This is the tricky bit you need to "see".
