The last option
I hope this is right let me know if its wrong and ill correct it
Answer How many liters of a 20% acid solution should be mixed with 30 liters of 50% acid solution in order to obtain a 40% solution. ... x=15 liters 15*(.20 pure acid)=3 liters 30*(.50 pure acid)=15 liters That is 18 liters pure acid That is 45 liters solution *0.45 pure acid=18 liters.
As more pure acid is added, the concentration of acid approaches 0.
Answer:
x=7.5
y=1.5
Step-by-step explanation:

subtract x from both sides




combine like terms

subtract 1.8 from both sides

divide both sides by 0.3
x=7.5


y=1.5
Sang grew more. and by 17/40 ( I could be wrong)
The dollar amount of each monthly payment is interest
7,865.87÷120=65.55
The percent of the total payments is total interest
(7,865.87÷27,865.87)×100=28.2%