Answer:
24 babies
Step-by-step explanation:
80%=20 babies
this means 100%=24 babies
So, start by calculating how much acid you have in your starting solution
25
L solution
⋅
60 L acid
100
L solution
=
15 L acid
Let's say that
x
denotes the volume of pure acid that you must add to your starting solution. Since you're dealing with pure acid, the volume of acid will Increase by
x
V
acid
=
15
+
x
At the same time, the volume of the solution will also incrase by
x
V
sol
=
25
+
x
This means that the target solution's percent concetration by volume will be equal to
V
acid
V
soL
⋅
100
=
75
%
(
15
+
x
)
L
(
25
+
x
)
L
⋅
100
=
75
%
Solve this equation for
x
to get
(
15
+
x
)
⋅
100
=
(
25
+
x
)
⋅
75
1500
+
100
x
=
1875
+
75
x
25
x
=
375
⇒
x
=
375
25
=
15 L
So, if you add 15 L of pure acid to 25 L of 60% v/v acid solution, you'll get 40 L of 75% v/v acid solution.
Answer:
20*(4/5)
Step-by-step explanation:
The expression you will use is :
20*(4/5) = 80/5 = 16
16 is 80 percent of 20 wich equals 4 fifths that's true
Answer:
x ≥ -1
Step-by-step explanation:
5(x + 8) = 5x + 40
40 + 5 + 5x ≥ 40
-40 -40
5 + 5x ≥ 0
-5 -5
5x ≥ -5
/5 /5
x ≥ -1