Let L be the low copper alloy and H be the high copper alloy.
We need 0.15L + 0.60H = 0.42 and L + H = 100
L=100 - H
Substituting this into the second equation for L, we get:
0.15(100-H) + 0.60H = 0.42(H+L)
15 - 0.15H + 0.60H = 0.42(H+100-H)
15 + 0.45H = 0.42(100)
0.45H = 42 - 15 = 27
H = 27/.45 = 60 lbs
Back substitution, L = 40 lbs.
Answer:
What is it?
Step-by-step explanation:
Hello! The answer to your question would be as followed:
20 / (3 * (20 - 3))
20 / (3 * 17!)
20 * 19 * 18 * 17 / (6 * 17)
20 * 19 * 18 / 6
20 * 19 * 3
20 * 57 =
1140
Answer:
Step-by-step explanation:
I think D
If you will count by cubes 3 cm+ 3 cm= 6
Answer: the answer is the first one. I just took the quiz.
Step-by-step explanation: