Question

A copper alloy that is 40% copper is to be combined with a copper alloy that is 80% copper to produce 120 kilograms of an alloy that is 70% copper. How many kilograms of each alloy must be used?

Answer 1

we need 70% of 120 kgs = 84 kgs copper
0.4x + 0.8y = 84 where x and y are weights of two alloys
x + y = 120
solve to get the answer

Answer 2

haha cant you just give me the answer :P

Answer 3

jimmy i got x equals 30 and y eqyuals 90 is that right jimmy boy? :p

Answer 4

yes

Answer 5

30 * 0.4 = 12 kgs
90*0.8 = 72 kgs

totals 12 + 72 =84
30 + 90 = 120

Answer 6

dead right