Question 934739
An alloy is a mixture of metals.
 Suppose that a certain alloy is made by mixing 100 grams of an alloy containing  35% copper with 60 grams of an alloy containing 55% copper.
 How many grams of copper are in the resulting mixture?
 What percentage of the resulting mixture is copper?
:
From the information given we know that the final mixture: 100+60 = 160 grams
:
let x = the percent copper of the final mixture 
35(100) + 55(60) = 160x
3500 + 3300 = 160x
6800 = 160x
x = 6800/160
x = 42.5%