Answer:
61.25%
Step-by-step explanation:
How many ml of 20 percent acid should be added to pure acid
to make 70 ml of 30 percent acid?
:
let x = amt of 20% mixture
then
(70-x) = amt of pure acid
:
0.20x + (70-x) =0 .30(70)
0.20x + 70 - x = 21
= 21 - 70
-0.8x =-49
x = 61.25%
x = +61.25 ml of 20% stuff
Answer:
4/5
Step-by-step explanation:
0.80=80/100=40/50=4/5
Answer:
Step-by-step explanation:
Answer:
yes she is correct
Step-by-step explanation:
because in 1 year it will go up 4.5%