# The alloy of gold and silver, gold contains 80%, the weight of the alloy is 1600 grams. a) how many grams

**The alloy of gold and silver, gold contains 80%, the weight of the alloy is 1600 grams. a) how many grams of gold are in the alloy. b) how many grams of silver are in the alloy. c) what percentage of silver is in the alloy. d) how many percent is the mass of silver from the mass of gold.**

a) Let’s calculate how many grams of gold are in the alloy, making up the proportion:

1600 – 100%,

Z – 80%.

Z = 1600 * 80: 100;

Z = 128000: 100;

Z = 1280 g is the mass of gold in the alloy.

b) Let’s calculate how many grams of silver are in the alloy:

1600 – 1280 = 320 g is the mass of silver in the alloy.

c) Let’s calculate how many percent of silver the alloy contains:

100% – 80% = 20% – silver contains an alloy.

d) Let’s calculate, percent is the mass of silver by mass of gold, making up the proportion:

1280 – 100%,

320 – S.

S = 320 * 100: 1280;

S = 32000: 1280;

S = 25% – is the mass of silver from the mass of gold.