An alloy of copper and zinc which contains 5 grams of zinc. If 15 grams of zinc are added to this alloy, a new alloy is obtained in which the copper content has been reduced by 30% from the original. Find

asked Jul 10, 2022 109k views

4 votes

7.5k points

Please log in or register to add a comment.

3 votes

Answer:

Initial mass = 25 grams

Step-by-step explanation:

$\left((x)/(x+20)\right)\:=\:\:\left((x)/(x+5)\:-.3\:\right)$

x = 20 (mass of copper)

(20)/(20+5) = .8 = 80 percent

$\\(20)/(20+15) = .5 = 50$ percent

Johel Alvarez answered Jul 17, 2022

8.5k points

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.5m questions

12.2m answers