The alloy contains 54% copper, 27% zinc, and the rest is lead. Find the mass of the alloy if it contains 95 g of lead.

1. Determine the percentage of copper and zinc in the alloy together:

54 + 27 = 81%;

2. Determine the percentage of lead in the alloy:

100 – 81 = 19%;

3. Determine the mass of the alloy. We take the mass of the alloy as a and make up the proportion:

95 g – 19%, and g – 100%;

95: a = 19: 100;

a = (95 x 100): 19;

a = 500 g.

Answer: the weight of the alloy is 500 grams.