Question

brass is an alloy of zinc and copper. If 30 % of the content is zinc, find the weight of zinc and copper in 300 grams of brass. ​

Answer 1

Step-by-step explanation:

To solve this I would think of the proportion as defining a “CHUNK” of brass whose total mass is the sum of the proportion values of the constituents. I.e. in every 20 kg CHUNK of brass there are 13 kg of Copper and 7 kg of zinc. Now how many of chunks do you have. Well, you have 100 kg of brass and each chunk is 20 kg, so by simple division you must have 5 chunks. How much zinc do you have ?

5 chunks × 7 kg zinc per chunk = 35 kg Zinc.