Find the percentage of silver in the alloy if 200 g of the alloy contains 42 g of silver.

In order to find the percentage of silver in the alloy, we will compose and solve the proportion.

Let’s see what we know from the condition. It is known that 200 grams of the alloy contains 42 grams of silver.

Let’s start by taking the weight of the entire alloy as 100%, and denote the silver content of the alloy as x percent.

We proceed to drawing up the proportion:

200 grams of alloy – 100%;

42 grams of silver – x%;

200/42 = 100 / x;

We are looking for an unknown factor:

x = (42 * 100) / 200 = 21% silver content in the alloy.