Answer:
Step-by-step explanation:
Therefore, the coefficient of 
is .
<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
Answer:
B
Step-by-step explanation:
He used 12 gallons of white paint.
Because 20 divided by 5 = 4. Meaning that 4 gallons is one part.
4 x 5 = 20
4 x 3 = 12
If a large pizza cost 15 dollars and the medium pizza is 9 dollars.Since the pizza parlor sold only 5 large pizzas, then… 15 x 5 = 75Deduct this from the total amount of pizza sold…$291 - $75 = $216So, the pizza parlor sold a total of $216 for the medium pizzas. Divide this to the amount of one medium pizza. $216 / 9 = 24.So the pizza parlor sold a total of 24 medium pizzas.
