Two jars contain 300 mL and 700 mL juice respectively. If both are poured into a big container, it will contain 1 L juice.
Two 600 mL pitchers contain orange juice. One pitcher is 1/3 full and the other pitcher is 2/5 full. Water is added to fill each pitcher completely, then both pitchers are poured into one large container. What fraction of the mixture in the large container is orange juice?