The alloy contains 58% copper 24% zinc, the rest of the lead, the mass of lead in the alloy is 270 g. Find the mass of the alloy.

Let’s calculate how much copper and zinc are in the alloy. We summarize the amount of copper – 58% and the amount of zinc – 24%.

58 + 24 = 82%.

The alloy contains 82% copper and zinc.

Let’s calculate how much lead is in the alloy. Subtract from the entire alloy – 100% the amount of copper and zinc in the alloy – 82%:

100 – 82 = 18%.

The alloy contains 18% lead.

Let’s make the proportion:

x gram – 100%,

270 grams – 18%

Let’s solve the proportion and find the unknown x:

x grams = 270 grams * 100%: 18% = 1500 grams.

The entire alloy weighs 1500 grams.

Answer: The entire alloy weighs 1,500 grams.