Question

A metalworker has a metal alloy that is 20% cooper and another alloy that is 60% cooper. How many kilograms of each alloy should the metalworker combine to create 80kg of a 52% cooper alloy?

Answer 1

Let x=the mass of 20% copper
Let y=the mass of 60% copper

x+y=80kg

.20x+.60y=.52(80)%
.20x+.60y=41.6%

Substitute or use elimination to find the amounts needed of 20% copper alloy and the amount of 60% copper alloy to make 80kg of 52% copper alloy :)

Answer 2

where did 80% came from?

Answer 3

@amonaroll32

Answer 4

It's .52(80)%, so 52% of 80 kg

Answer 5

ok

Answer 6

If you're stuck you can try to find y by subtracting 20% of the mass from the percentage. So basically (.20x+.60y=41.6)-.20(x+y=80)

Answer 7

im just writing it

Answer 8

Lol alright then, call me if you need any help :)

Answer 9

Thanks

Answer 10

Np