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Lemur [1.5K]
3 years ago
11

Two solutions of different concentrations of acid are mixed creating 40 mL of a solution that is 32% acid. One-quarter of the so

lution is made up of a 20% acid solution. The remaining three-quarters is made up of a solution of unknown concentration, c. Which equation can be used to determine c, the unknown concentration? 30c + 10(0.2) = 40(0.32) (c) + (0.2) = 40(0.32) (c)( (0.2)) = 40(0.32) 30(c)(10(0.2)) = 40(0.32)
Mathematics
2 answers:
Georgia [21]3 years ago
6 0
In order to construct this equation, we will use the variables:
V to represent mixture volume (40 ml)
C to represent mixture concentration (0.32)
v₁ to represent volume of first solution (40 / 4 = 10 ml)
c₁ to represent concentration of first solution (0.2)
v₂ to represent the volume of the second solution (40 * 3/4 = 30 ml)
c₂ to represent the concentration of the second solution 


We know that the total amount of substance, product of the volume and concentration, in the final solution is equal to the individual amounts in the two given solutions. Thus:
VC = v₁c₁ +  v₂c₂
40(0.32) = 10(0.2) + 30c
n200080 [17]3 years ago
4 0

Simplified Answer:

A.  30c + 10(0.2) = 40(0.32)

(for edg)

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dedylja [7]

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Step-by-step explanation:

If the basic recipe is 2 water to 3 juice, and they used 4 quarts if water, you can see that is <u>double the amount of</u> water so you need <u>double the amount  </u> of juice. 2 times 3 is 6.

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andreev551 [17]

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7 0
3 years ago
What is the percent of change from 4 to 5?
enot [183]

Answer:

The formula for calculating the percent change in a value between two points in time is:

p

=

N

−

O

O

⋅

100

Where:

p

is the percent change - what we are solving for in this problem.

N

is the New Value - 5 in this problem.

O

is the Old Value - 4 in this problem.

Substituting and solving for

p

gives:

p

=

5

−

4

4

⋅

100

p

=

1

4

⋅

100

p

=

100

4

p

=

25

There was a 25% increase from 4 to 5.

Step-by-step explanation:

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