The answer is B.<span> 3 : 5 = 12 : 20
2:3 doesn't equal 3:2 because they are backwards
42:7 doesn't equal 6:2 because 42:7 simplifies to 6:1 which is not equal to 6:2
14:6 doesn't equal 28:18 because 14:6 simplifies to 7:3 and 28:18 simplifies to 14:9, and these two proportions are not equal</span>
Alexis can wash a total of 14 windows in 1 hour
<h3><u>Solution:</u></h3>
Given that Alexis washes
windows in
hours
<u><em>To find: </em></u>number of windows washed in one hour
To simplify the calculations we will convert the given mixed fraction to improper fraction
![\begin{array}{l}{=10 \frac{1}{2}} \\\\ {=\frac{2 \times 10+1}{2}} \\\\ {=\frac{21}{2}=10.5}\end{array}](https://tex.z-dn.net/?f=%5Cbegin%7Barray%7D%7Bl%7D%7B%3D10%20%5Cfrac%7B1%7D%7B2%7D%7D%20%5C%5C%5C%5C%20%7B%3D%5Cfrac%7B2%20%5Ctimes%2010%2B1%7D%7B2%7D%7D%20%5C%5C%5C%5C%20%7B%3D%5Cfrac%7B21%7D%7B2%7D%3D10.5%7D%5Cend%7Barray%7D)
Hence, to wash 10.5 windows, Alexis takes 0.75 hours
Let "n" be the number of windows washed in 1 hour
10.5 windows ⇒ 0.75 hours
"n" windows ⇒ 1 hour
By cross-multiplication we get,
![n \times 0.75 = 10.5 \times 1](https://tex.z-dn.net/?f=n%20%5Ctimes%200.75%20%3D%2010.5%20%5Ctimes%201)
![n = \frac{10.5}{0.75} \\\\n = 14](https://tex.z-dn.net/?f=n%20%3D%20%5Cfrac%7B10.5%7D%7B0.75%7D%20%5C%5C%5C%5Cn%20%3D%2014)
Thus Alexis can wash 14 windows in one hour
Answer: 22.5°
Step-by-step explanation:
Complementary angles are the angles that when we add them together, they're equal to 90°.
Let the smaller angle be represented by x.
Then, the larger one will be 3 × x = 3x
We then add both angles together and equate them to 90°. Therefore,
x + 3x = 90°
4x = 90°
x = 90/4
x = 22.5°
The smaller angle is 22.5°
Given that in triangle XYZ and MPN XY=MP, YZ=PN and the ratio of XZ to MN is 23/19.
Thus the possible size of angle Y given that mP=85 will be:
mY/P=23/19
mY/85=23/19
mY=23/19*85
mY=102.9
The approximate value is therefore mY=100
Read more on Brainly.com - brainly.com/question/4071431#readmore