Question

A metalworker has a metal alloy that is 25​% copper and another alloy that is 70​% copper. How many kilograms of each alloy should the metalworker combine to create 100 kg of a 61​% copper​ alloy?

Answer 1

28kg for copper

Explanation:

Answer 2

Explanation:

let 25 % copper=x kg

75 % copper=(100-x) kg

0.25 x+(100-x)*0.75=100*0.61

25x+7500-75 x=6100

-50 x=-1400

50 x=1400

5x=140

x=28

25 % of Copper=28 kg

75 % of Copper=100-28=72 kg