Answer:
The addition of 4 liters of 25% solution to 6 liters of 50% solution produces 10 liters of 40% solution.
Step-by-step explanation:
Hope this helps.
Super sorry if it doesn't.
2y = x-6, x=9
2y = 9-6; plug 9 in for x
2y = 3; evaluate 9-6
y = 3/2; divide each side by 2
x = 9
y = 3/2
Hope this helps!
Answer:

Step-by-step explanation:
d = 
d = 
d = 
d =
= 
Answer:
c=$125
Step-by-step explanation:
9:30--12:30 is three hours, then another half hour till 1pm total hours is 3.5
c = 20+30*3.5
c=20 + 105
c = 125