You will need 252 mL of pure water to obtain 0.25 mL of the desired 25% solution.
If we add X amount of water to the solution, the total amount of solution is 375+X.
And that must be 25%.
<h3>
What is the amount of solute in the current solution?</h3>
The amount of solute in the current amount of solution is
0.6(375)=225.
That amount won't change by adding water.
So we set up the equation so that the amount of solute divided by the new total amount of solution equals 25%.
225/(375+X)=0.25
cross multiply and solve
225/0.25=(375+X)
900-375=X
X=525
The pure water will you need to add to obtain the desired solution is 525.
Then we check 225/(375+525)=0.25.
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He needs to have 5 rows of 5 seats if there will be 25 people because 5 x 5 = 25
Answer:
A = 20% B = 36%
Step-by-step explanation:
35 in total bought
2/10 = who bought model A = 20%
16+9 = 25 => 9/25 who bought model B = 36%
Answer:
1092π ft³
Step-by-step explanation:
The formula for the volume of a sphere is
V = ⁴/₃πr³
1. Volume of larger sphere
V₁ = ⁴/₃π (11)³ = ⁴/₃π × 1331 = 1774⅔π ft³
2. Volume of smaller sphere
V₂ = ⁴/₃π (8)³ = ⁴/₃π × 512 = 682⅔π ft³
3. Difference of volumes
V₁ - V₂ = 1774⅔π ft³ - 682⅔π ft³ = 1092π ft³ ≈ 3431 ft³
The difference of volumes of the spheres is 1092π ft³.
Answer:
1.5 miles
Step-by-step explanation:
To get the number of miles she has jogged, what we need do is to add the distance she jogged to the high school track and the distance of the tracks
We know from the question that the laps are 0.25 miles each and there are 4. The total number of miles jogged around is thus 4 * 0.25 = 1 mile
If we now add this to the former half mile, we have the following:
1 + 0.5 = 1.5 miles
