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Snowcat [4.5K]
3 years ago
8

mary mixes white paint with blue paint in the ratio 2:3. she makes a total of 20 litres of paint . how much more paint will she

need to add to the mixture so that the ratio of the white paint to blue paint will be 1:7
Mathematics
2 answers:
Anastasy [175]3 years ago
8 0


Mary has 20 liters of paint mixed white:blue in the ratio 2:3.  So two fifths of that paint is white and three fifths is blue.  So that's 8 liters white, 12 liters blue.

We want to add paint to get white:blue = 1:7.  Clearly we need to add blue.  We have our 8 liters of white, so we need a total of 7(8)=56 liters of blue.  We already have 12, so we have to add 56-12=44 liters of blue paint:

Answer: Add 44 liters blue

snow_tiger [21]3 years ago
5 0

44 Litres

That’s the answer of what I got

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Step-by-step explanation:

Use the appropriate formula from your list of area and volume formulas.

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For this case we have the following fractions:

\frac {11} {2}\\\frac {6} {11}

We must rewrite the fractions, using the same denominator.

We have then:

We multiply the first fraction by 11 in the numerator and denominator:

\frac {11} {2} \frac {11} {11}

We multiply the second fraction by 2 in the numerator and denominator:

\frac {6} {11} \frac {2} {2}

Rewriting we have:

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For the second fraction:

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3 years ago
If sinA+cosecA=3 find the value of sin2A+cosec2A​
Irina18 [472]

Answer:

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Step-by-step explanation:

Let f(A) = \sin A + \csc A, we proceed to transform the expression into an equivalent form of sines and cosines by means of the following trigonometrical identity:

\csc A = \frac{1}{\sin A} (1)

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Since sine is a bounded function between -1 and 1, the only solution that is mathematically reasonable is:

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By means of inverse trigonometrical function, we get the value associate of the function in sexagesimal degrees:

A \approx 22.457^{\circ}

Then, the values of the cosine associated with that angle is:

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