Your post is confusing? Are you calling buttermilk and butterfat the same?
You drank 3L milk x 0.0236 = 0.0708 L buttermilk in that 3L.
For the second part,
grams = volume x density
volume buttermilk you drank is 3L = 3000 mL and it is 2.36% buttermilk, then in 3L you drank 3000 mL x 0.0236 = 70.8 mL (all just a repeast from above but changing to mL and not L).
Then g = volume x density = 70.8 mL x 0.79 g/mL = ? g buttermilk.
Assume low fat milk is 2.36 % buttermilk by volume. If you drink 3 L of milk, how many liters of butterfat have you drunk? =.0708 L
Given that the density of the buttermilk is measured to be 0.79 g/mL and you have not drunk anymore milk, how many grams of buttermilk have you drunk? (in grams)
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