Platinum alloy consists of nickel (45%), carbon (0.15%) and iron.

Platinum alloy consists of nickel (45%), carbon (0.15%) and iron. Find the mass of a product made of platanite, if you know that the mass of nickel in it is 90g.

Let’s designate the weight of the finished platinum product per x grams. According to the text, we have 90 grams of nickel, which is 45% of the total weight of the platinum item.

Now we can make the following proportion, based on the condition of the problem:

90 = 45%

x = 100%

Therefore, we get the equation:

x * 45% = 90 * 100%

x * 45 = 9000

x = 9000: 45

x = 200 (grams)

Answer: 200 grams is the weight of a platinum item.