Answer:
We will have to assume that both the 30% and 70% alloys "weigh" the same. (Have the same density.)
We'll call the 30 % copper "t" and the 70 % copper "s"
A) t + s = 120
B) .30t + .70s = .54 * 120
Multiplying equation A) by -.30 we get
A) -.30t -.30s = -36 then adding this to B)
B) .30t + .70s = 64.8 we get
.40s = 28.8
s = 72 kg and t = 48 kg
Double-Check
48 * .30 + 72 * .70 = 14.40 + 50.40 = 64.8 and
64.8 / 120 = .54 = 54 per cent
Correct!!!
Source: https://www.1728.org/mixture.htm
See Example A
Step-by-step explanation:
Answer:
Step-by-step explanation:
Well you can represent percentages as decimals, by dividing the percentage by 100. This gives us the fraction: 
We can simplify the fraction, by dividing both the numerator and denominator by 5
Answer:
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Answer:
y = 7x - 14
Step-by-step explanation:
If the given line has slope -1/7, then any perpendicular line has the slope which is the negative reciprocal of -1/7. That is +7.
Apply the slope-intercept formula for the equation of a straight line, using 0 for y, 2 for x and searching for the y-intercept value b:
0 = 7(2) + b. Then b = -14, and the desired equation is y = 7x - 14.
