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

Question

2 years ago

11

in which the copper content has been reduced by 30% from the original. Find the initial mass of the alloy

1 answer:

Ganezh [65] · Answer 1 · 2022-09-20T20:15:40+03:00

3 0

Answer:

Initial mass = 25 grams

Step-by-step explanation:

$\left(\frac{x}{x+20}\right)\:=\:\:\left(\frac{x}{x+5}\:-.3\:\right)$

x = 20 (mass of copper)

$\frac{20}{20+5} = .8 = 80$ percent

$\\\frac{20}{20+15} = .5 = 50$ percent