How many liters of a 15% sugar solution must be mixed with 5 liters of a 45% sugar solution to give a 20% solution? Select one:

a.
4 liters

b.
25 liters

c.
30 liters

d.
11 liters

25 liters

Step-by-step explanation:

15x + 45(5) = 20(x + 5)

15x + 225 = 20x + 100

Simplify

125 = 5x

Divide both sides by 5

25 = x

25 liters

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

step-by-step explanation:

graph using a few selected

x         y

-1       15

0         6

1         2.4

2       0.96