Alloy weighing 140g consists of gold and silver. The percentage of gold content in the alloy is -20 percent. Find the mass of silver in the alloy.
Let’s take the weight of the entire alloy as 100%, and the weight of gold in the alloy as x. We make a short entry:
140 g – 100%;
x city – 20%.
The proportion is obtained: 140 / x = 100/20.
According to the rule of proportion: 100x = 140 * 20.
100x = 2800;
x = 2800/100 = 28 (g) gold in the alloy.
Let’s find the amount of silver in the alloy: 140 – 28 = 112 (g) silver.
Answer: in the alloy 112 g. Silver.
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