The manufacture of an iron container requires 3 kg 330 g of iron, and the manufacture of a lid for this container

The manufacture of an iron container requires 3 kg 330 g of iron, and the manufacture of a lid for this container requires 3 times less metal mass, how many kilograms of metal are needed to make 4 such containers with lids.

1) Find out what the mass of metal is equal to for making a lid, for an iron container.

3 kg 330 g / 3 = 1 kilogram 110 grams.

2) How much does an iron container with a lid weigh?

3 kg 330 g + 1 kg 110 g = 4 kilograms 440 grams.

3) How many kilograms of metal do you need to take to make 4 such containers with lids?

4 kg 440 g * 4 = 16 kg 1760 g = 15 kilograms 760 grams.

Answer: For the manufacture of four containers with lids, you need to take fifteen kilograms of seven hundred and sixty grams of metal.