The ratio of boys and girls in the school chorus is 4 to 5. There are a total of 20
boys in the chorus. How many students are
in the chorus?

45

Step-by-step explanation:

20 boys= 5 times the ratio

So, 5x5=25

25 girls and 20 boys= 45 students

45 students

Step-by-step explanation:

to make sure there are 20 boys you need to multiply 4 by 5

so multiply the 5 by 5 as well

then add what you get!!

To solve this, you'll need the arc length formula for degrees:
2*radius(C/360)
(C is "central angle")

2*radius is the circumference of the entire circle, 360 is a full angle, so this formula gives you the ratio of full circumference/full angle to the angle and arc length you have.

2*7(45/360) = 5.497
= 5.50 to the nearest hundred.