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You have your units mixed up. One milliliter (ml) equals one cubic centimeter (cc.) One cc of water at 4°C has a mass of one gram (g.) Kilo is the multiplier that means x1000. Therefore 1000 ml (or cc) of water has a mass of 1000 g or 1 Kilogram (Kg.)
2 liters and 1/2 liter = 2,500 milliliters, IF he filled both of them.
Here's how to proceed:Fill container B with 3 liters.Pour the 3 liters from container B into container A.Fill container B again with 3 liters.Carefully pour from container B into container A, until container A is full.Container A already had 3 liters, so it only takes 2 more liters to fill it to 5 liters, leaving 1 liter remaining in container B.
That depends what substance you have a kilogram of.A kilogram of air fills many many cc.A kilogram of water fills only 1,000 cc (1 liter).A kilogram if ice fills a few more cc than a kilogram of water does.A kilogram of lead, gold, or rock fills only a small number of cc.