9/5 is the answer, hope this helps
<span>Dr. Graham currently has two acid solutions.
60% acid AND 20% acid </span>
Dr. Graham needs 30 L of a 50% acid solution
We set up 2 equations in which s = 60% acid and t = 20% acid
A) s + t = 30
B) .60s + .20t = (.50 * 30)
We multiply equation A by -.20
A) = -.20s -.20t = -6 then we add it to B)
B) .60s + .20t = 15
.40s = 9
s = 22.5
t = 7.5
So, she needs to mix 22.5 liters of 60% acid with 7.5 liters of 20% acid.
Source:
http://1728.org/mixture.htm
Step-by-step explanation:
General equation of a line in slope intercept form is given by
y = mx+c
where m is slope and c is y-intercept
Here, y = 5x+9
7(8) -5(8)
= 8* (7-5) (distributive property)
= 8*2
= 16
The final answer is 16~
