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Doan mixes together 1 litre of 1% butterfat milk, 2 litres of 2% butterfat milk and 4 litres of 4% butterfat milk. What percentage of the resulting seven litres of milk is butterfat?

 Jun 27, 2020
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sum of ingredients = final ingredients

 

1%(1liter) = .01 (1)      2% of 2 liters = .02(2)

 

.01(1)    + .02(2)      + .04(4)    =   x  (7 liters)       solve for   x = .03   or    3%

 
 Jun 27, 2020

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