When soldering tin products, an alloy containing 2 parts of lead and 5 parts of tin is used. How many kilograms of lead

When soldering tin products, an alloy containing 2 parts of lead and 5 parts of tin is used. How many kilograms of lead and tin are contained in a piece of alloy weighing 2 9/20 kg.

Let’s find how many parts of the metal are contained in the alloy:

2 + 5 = 7.

This means that lead is 2/7 of the total mass of the alloy, and tin is 5/7 of the total mass of the alloy. To find the mass of each metal in the alloy separately, you need to multiply the total mass by the part that the metal makes up. Let’s find the mass of lead in the alloy:

2 9/20 * 2/7 = 49/20 * 2/7 = 7/10 = 0.7 kg.

Let’s find the mass of tin in the alloy:

2 9/20 * 5/7 = 49/20 * 5/7 = 7/4 = 1.75 kg.

Answer: the mass of lead in the alloy is 0.7 kg; the mass of tin in the alloy is 1.75 kg.