The amount of liters of water that should be added to 20 liters of 40% solution of acid to obtain 30% solution is: 6.7 Liters.
<h3>
Liters of water needed</h3>
Acid = 0.4× 20
Acid = 8 liters
Water = 0.6× 20
Water = 12 liters
Acid/(Acid+Water)
A / (A + W) = 0.30
8 / (8 + W) = 0.30
2.4 + 0.3W = 8
0.3W = 8 - 2.4
0.3W= 5.6
Divide both side by 0.3W
W=5.6/0.3
W=18.7 Liters
18.7 - 12 = 6.7 Liters (Amount of water that must be added)
Therefore the amount of liters of water that should be added to 20 liters of 40% solution of acid to obtain 30% solution is: 6.7 Liters.
Learn more about Liters of water needed here: brainly.com/question/23918882
#SPJ1
9514 1404 393
Answer:
Step-by-step explanation:
Let g and b represent the numbers of candy canes the girl and boy have, respectively.
g -1 = b +1 . . . . . . girl gives to boy, they're equal
g +1 = 2(b -1) . . . . boy gives to girl; she has double
Adding 1 to the first equation gives an expression for g that can be substituted into the second equation.
g = b +2
(b +2) +1 = 2b -2
5 = b . . . . . . . . . . add 2-b, simplify
g = 5+2 = 7 . . . . . find g
The girl has 7 candy canes; the boy has 5.
The x=16 because you gotta subtract x one one side to make it a simple two step equation then to simplify x from 5x divide by 5 on both sides