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Anastasy [175]
3 years ago
13

How many ml of a 70% alcohol solution must be mixed with 2 ml of a 85% alcohol solution to make a 75% solution?

Mathematics
1 answer:
yaroslaw [1]3 years ago
3 0

Answer:

0.133 ml

Step-by-step explanation:

The two available solutions to be used in the mixture are a 70% solution and a 85% solution .

x = volume of 70% solution

y = volume of 85% solution

y = 2 ml

Therefore;

0.7 x + 0.85(2) = 0.75(x+2)

0.7x + 1.7 = 0.75x + 1.5

multiply through by 10 to get rid of the decimals

7x + 17 = 7.5x +15

collecting and simplifying

-0.5 x = -0.2

divide both sides by -1.5

   x = -0.2/-1.5

   x = <u>2/15 ml or 0.1333 ml</u>

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−5/8+3/4 equals what, In fraction form.
kipiarov [429]

How to get answer by Mimiwhatsup (In Decimal Form):

-5/8+3/4\\\mathrm{Divide\:the\:numbers:}\:5\div \:8=0.625\\=-0.625+3\div \:4\\\mathrm{Divide\:the\:numbers:}\:3\div \:4=0.75\\=-0.625+0.75\\\mathrm{Add/Subtract\:the\:numbers:}\:-0.625+0.75=0.125\\=0.125

Answer in Fraction Form: \frac{1}{8}

7 0
3 years ago
a 5th grade volleyball team scored 32 points in one game. of those points 2/8 were scored in the second half. how many points we
Degger [83]

Answer:

Number of points scored in the first half of the match is 24 points.

Step-by-step explanation:

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Let us assume the points scored in the first half = m

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= \frac{2}{8}  \times  32  = 8

⇒ The number of points s cored in the second - half  =  8 points

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or, m  = 32 - 8 =  24

⇒ m = 24

Hence, the number of points scored in the first half is 24 points.

4 0
3 years ago
Solve the given inequality 11x-20&lt;_13​
RUDIKE [14]

Answer:

x ≤ 3

Step-by-step explanation:

11

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Step 2: Divide both sides by 11.

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3 years ago
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Subtract the first equation from the second again

0 = x - 1

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Subtract x from both sides of the first equation

- x =  - 1

y =      4

Divide the first equation by (-1)    

x =  1

y =  4

<h3>So, the solution is  x = 1  and  y = 4   {or: (1, 4)}</h3>
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3 years ago
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3 years ago
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