The alloy contains 6% tin. How many kilograms of tin is contained in 520 kg of alloy?

We know from the condition that the alloy contains 6% tin. In order to find how many kilograms of tin are contained in 520 kg of alloy, we will compose and solve the proportion.

Let’s take the weight of the alloy as 100%. And using the variable x kg, we denote the weight of tin in the alloy.

Let’s now compose and solve the proportion.

520 kg – 100%;

x kg – 6%.

520 / x = 100/6;

We need to find the unknown middle term of the proportion. To do this, we divide the product of the extreme terms by the known average term of the proportion.

x = (520 * 6) / 100 = 3120/100 = 31.2 kg of tin in the alloy.