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SVEN [57.7K]
3 years ago
8

How many milliliters of 0.30% sugar solution must you add to 75mL of 4% sugar solution to get a 0.50% sugar solution?

Mathematics
2 answers:
Andrews [41]3 years ago
6 0

Answer: We need to add 1312.5 mililiters.

Step-by-step explanation:

We have a solution of 75ml of 4% of sugar, and we want to know hoy many mililites of 0.30 sugar solution we need to add if we want to get to a solution of 0.50%.

First, we if we add X mililiters of the second solution, we have that the total number of mililiters is:

X + 75 = M

and we also have that for the mixture we need to have that the percentage of sugar in both components corresponds to:

(X*0.003 + 75*0.04) = M*0.005

where i written the percentages as decimals.

now we can write this as:

(X*0.003 + 75*0.04) = (X + 75)*0.005

now we can solve this for X.

(75*0.04 - 75*0.005) = X*0.005 - X*0.003 = X*0.002

2.625 = X*0.002

X = 2.626/0.002 = 1312.5 mililiters.

hammer [34]3 years ago
4 0
Based on the given data above, the equation below has been generated,
(X mL)(0.003) + 75 mL (0.04) = 0.005 (75 + X); X being the amount in mL of the sugar solution, by further simplification of the generated equation, it can be said that 1312.5 mL of 0.30% sugar solution should be added to 75 mL of 4% solution to come up with a 0.5% sugar solution.
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A health and fitness club surveys 40 randomly selected members and found that the average weight of those questioned is 157 lb.
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Answer:

B. Statistic

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6 0
3 years ago
Without sketching the graph solve -6-x>10
kompoz [17]

Answer:

x < -16

Step-by-step explanation:

-6-x>10

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5 0
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Read 2 more answers
the ratio of boys to girls in janices classroom is 3:5, and there are a total of 32 students in the class, help plss​
svetoff [14.1K]

9514 1404 393

Answer:

  • 12 boys
  • 20 girls

Step-by-step explanation:

The total number of students (32) corresponds to the total number of ratio units (3+5 = 8), so each ratio unit represents 32/8 = 4 students.

The 3 ratio units representing boys will stand for 3×4 = 12 boys.

The 5 ratio units representing girls will stand for 5×4 = 20 girls.

There are 12 boys and 20 girls in Janice's classroom.

_____

<em>Additional comment</em>

I find the above solution to be the easiest.

You can also write a system of equations. Let b and g represent the numbers of boys and girls, respectively.

  b/g = 3/5

  b +g = 32

Multiplying the first equation by g gives an expression for b that can be substituted into the second equation:

  b = (3/5)g

  (3/5)g +g = 32

  8/5g = 32 . . . . . . . . . . . . . . . . . collect terms

  g = (5/8)(32) = 5·4 = 20 . . . . . . multiply by 5/8

  b = (3/5)(20) = 3·4 = 12 . . . . . . . find b using the value of g

5 0
2 years ago
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