The alloy contains 11% copper. how much copper is contained in 370 kg of such an alloy?

We know from the condition that the alloy contains 11% copper. In order to find how much copper is contained in 370 kg of such an alloy, let’s compose and solve the proportion.

Let us denote by the variable x kg the weight of copper in the alloy. And for 100% we will take the entire weight of the alloy.

Let’s figure out the proportion.

370 kg – 100%;

x kg – 11%.

370 / x = 100/11.

Next, we are looking for an unknown average term of the proportion, for this we divide the product of the extreme terms by the known average term of the proportion.

x = (370 * 11) / 100 = 4070/100 = 40.7 kg of copper in the alloy.