Answer:
B
Step-by-step explanation: B is the only reasonable answer
Answer: The Answer is 1/2.
Step-by-step explanation: You divide both numbers by 7 to get 4/8. Then you divide that down to 2/4, and then you divide that down to 1/2.
1/2 pounds,
assuming that each friend takes an equal part of the 2 1/2 pounds, then 2 1/2 divided by 5 would get you 1/2 pound
Got the question again i'm going to try vertical stretch
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Let's say x = 15% copper and y = 75% copper
We need 120 kg of a 51% copper alloy.
A) x + y = 120
B) .15x + .75y = 61.2 (which is 120*.51%)
Multiplying A by -.15
A) -.15x -.15y = -18 Then add this to B
.60y = 43.2
y = 72
x = 48
I'd suggest you look at this web page
http://www.1728.org/mixture.htm
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Double Check
48 kilograms of .15% copper = 7.2 kg copper
72 kilograms of .75% copper = 54 kg kg copper
So we have 61.2 kg of copper in 120 kg
61.2 / 120 = .51 = 51%
