Question 1181335: if you mix 3 liters of can A which contains 10% oil with 6 liters of can B which contains 40% oil, how much oil is in the mixture? Answer by ikleyn(52782) (Show Source):
There are 0.1*3 liters of oil = 0.3 liters of oil in can A.
There are 0.4*6 liters of oil = 2.4 liters of oil in can B.
To get the answer, add the liters of oil in individual cans.